Cognitive Challenges

Test your brain.
Challenge your friends.

Short cognitive challenges — reaction time, memory, focus and more. Get your score. Challenge anyone to top it. No signup. No paywall.

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Challenges

16 free brain challenges
MemoryMedium

Number Memory Challenge

A number flashes on screen. Remember it and type it back. Each level adds one more digit. How far can you go?

MemoryMedium

Visual Memory Challenge

Tiles flash on the grid. Remember which ones lit up — then tap them back. Each level adds one more tile and the grid gets bigger.

MemoryMedium

Verbal Memory Challenge

A word appears. Tap SEEN if it has shown up before in this game. Tap NEW if this is the first time you're seeing it. Your word bank never resets. One wrong answer ends it.

MemoryHard

Sequence Memory Challenge

Tiles light up one at a time. Remember which ones and the exact order they appeared. One wrong tap and it's over.

MemoryHard

Chimp Memory Challenge

Numbers flash briefly on a grid then disappear. Tap the squares in order from lowest to highest. Simple to understand — surprisingly hard to master. How far can you go?

Deep ThinkingMedium

Pattern IQ Challenge

A number sequence appears. Find the pattern and pick the next number from 4 choices. Patterns escalate from simple arithmetic to multi-step rules. How far can you go?

Deep ThinkingMedium

Matrix Reasoning Challenge

A 3×3 grid of shapes — one cell is missing. Find the pattern across rows and columns. Pick the correct missing piece from 4 options. Levels add more complex rules.

Deep ThinkingMedium

8 Puzzle Challenge

Slide the tiles into the correct order. One empty space, eight numbered tiles. Pure logic and planning — no luck. Levels get harder with more scrambling. How far can you go?

Deep ThinkingMedium

6×6 Number Grid Challenge

Fill every row, column and 2×3 box with numbers 1–6. 3 mistakes and the game is over. Levels get harder — how far can you go?

Deep ThinkingHard

Mental Arithmetic Challenge

A number appears, then operations one at a time. Hold the running total in your head — no writing. Pick the right answer at the end. Levels add more steps and harder operations.

Deep ThinkingHard

9×9 Number Grid Challenge

Fill every row, column and 3×3 box with numbers 1–9. 3 mistakes ends it. Levels escalate from easy to expert. The real test.

FocusMedium

Zone Sort Challenge

A number appears. Is it odd or even? High or low? Tap the correct colour zone. Rules change every level — odd/even gives way to primes, then divisibility. How fast can you sort?

FocusHard

Stroop Colour Challenge

A colour word flashes — but it's written in the wrong ink. Name the ink colour, not the word. Your brain will fight you. Can you stay ahead?

FocusHard

The Opposite Challenge

See odd? Tap even. See a prime? Tap not prime. See positive? Tap negative. Your instinct will fight you. Override it — every time.

SpeedEasy

Reaction Time Challenge

Wait for the bolt. Tap the moment you see it. Get your time in milliseconds. How fast are you?

SpeedMedium

Rapid Comparison Challenge

Two numbers appear side by side. Are they the same or different? Sounds easy — until the numbers get longer. Pure processing speed.

How it works

Play. Score. Challenge your friends.

01

Pick a challenge

Just tap and go. No account, no email, no friction.

02

Play it

Follow the on-screen instructions. Some challenges take a minute, others like the number grid and 8 puzzle can take longer.

03

Get your score

Your result is instant. Track your personal best over time.

04

Challenge your friends

Share your score on WhatsApp with one tap. Dare them to top it.

FAQs

A free collection of short cognitive challenges — reaction time, memory, deep thinking and focus. Take one, get your score, challenge friends to top it. No signup. No paywall.

No login needed. Just tap and play. Your scores save in your browser automatically so you can track your progress next time.

Nowhere. Your scores live only in your browser, on your own device.

Your scores are a good personal benchmark — great for tracking your own progress and competing with friends. Treat them as a fun challenge rather than a precise measurement.

Speed Easy

Reaction Time Challenge

Click the moment you see the bolt. Get your time in milliseconds. Repeat to beat your own score. Challenge your friends to top yours.

How to play
01
Wait for the bolt
A random delay keeps you on your toes. Don't click early!
02
Click the moment you see it
Click anywhere in the box as soon as the bolt appears.
03
5 attempts
Your score is the average of 5 tries — one lucky click doesn't count.
04
Challenge your friends
Share your scorecard. Invite them to top your time.
1st—
2nd—
3rd—
4th—
5th—
Wait…
Stay focused. Don't click early!
Click!
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Click anywhere to continue →
Too early!
You clicked before the bolt appeared.
Click anywhere to retry.
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The Score Scale
🚀Supersonic<160ms
⚡Lightning Fast160–200ms
🎯Sharp200–245ms
👍Decent245–290ms
🐢Taking Your Time290–350ms
😴Sleepy Mode>350ms

About this challenge

Your score is the average milliseconds it took to click after the bolt appeared, across 5 attempts. Lower is faster.

One attempt is too noisy. Five gives you a fair average and shows how consistent you are, not just how fast you were once.

Your reaction time changes with how rested you are, how focused you feel, and whether you’ve warmed up.

Sleep well. Stay focused. Warm up with a couple of attempts first. Your score naturally improves as you settle in.

Memory Medium

Number Memory Challenge

A number flashes on screen. Remember it, type it back. Each level adds one more digit. One wrong answer ends it. How far can you go?

How to play
01
Watch the number
A number flashes for a moment. Focus — it disappears quickly.
02
Type it back
Enter the number exactly as shown using the keypad or your keyboard.
03
One mistake ends it
Get it wrong and the game ends. Start at 3 digits — each correct answer adds one more. No ceiling.
04
Challenge your friends
Share your scorecard. Invite them to top your level. Can they beat you?
Level 1 3 digits
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The Memory Scale
🚀SuperhumanLevel 13+ (15+ digits)
🏆Memory ChampionLevel 10–12 (12–14 digits)
⚡Excellent MemoryLevel 7–9 (9–11 digits)
🧠Sharp MemoryLevel 5–6 (7–8 digits)
📖Average MemoryLevel 3–4 (5–6 digits)
🌱Just StartingLevel 1–2 (3–4 digits)

About this challenge

Your score is the highest level you cleared. Each level adds one more digit. For instance, level 6 means you remembered 8 digits in a row — keep playing to push your personal best further.

Each level adds one more digit. That doesn’t sound like much — but it gets surprisingly tough very quickly.

Yes — with practice. Common techniques: chunking (grouping digits into pairs), rhythm (giving the digits a beat), and visualisation (turning numbers into images).

Nowhere. Your scores are saved only in your browser, on your own device.

Memory Medium

Visual Memory Challenge

Tiles flash on the grid. Remember which ones lit up — then tap them back. No order needed, just position. Each level adds one more tile.

How to play
01
Watch the grid
Tiles flash orange briefly. Focus on which ones light up.
02
Tap them back
When the grid goes dark, tap every tile that was lit. Order doesn't matter.
03
Levels keep growing
Each level adds one more tile and the grid grows. One wrong tap ends the game — your score is your highest level.
04
Challenge your friends
Share your scorecard. Invite them to top your level. Can they beat you?
Level 1 3 tiles on a 3×3 grid
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The Visual Memory Scale
🚀PhotographicLevel 13+ (7×7)
🏆Visual ChampionLevel 10–12 (6×6)
⚡Sharp EyeLevel 7–9 (5×5)
🎯Good MemoryLevel 4–6 (4×4)
👀Getting Warmed UpLevel 3 (3×3)
🌱Just StartingLevel 1–2 (3×3)

About this challenge

Your score is the highest level you cleared. Each level adds one more tile and eventually grows the grid. The higher the level, the more tiles you successfully remembered in one go.

No — you just need to tap all the correct tiles, in any order. This is different from Sequence Memory, where order matters.

Yes. Try grouping the lit tiles visually into clusters or shapes rather than memorising each one individually. Spatial chunking is the most effective strategy.

Nowhere. Your scores are saved only in your browser, on your own device.

Memory Hard

Sequence Memory Challenge

Tiles light up one at a time. Watch the sequence, then tap them back in the exact same order. One wrong tap ends it. How far can you go?

How to play
01
Watch the sequence
Tiles light up one at a time. Each tile shows its position number. Stay focused.
02
Replay it exactly
Tap the tiles back in the exact same order. Position and sequence both matter.
03
Each level adds a tile
The sequence grows by one every level. Tap out of order and the game ends — your score is your highest level.
04
Challenge your friends
Share your scorecard. Invite them to top your level. Can they beat you?
Level 1 3 tiles | 3×3 grid
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The Sequence Scale
🚀Sequence MasterLevel 13+ (15+ tiles)
🏆Pattern ChampionLevel 10–12 (12–14 tiles)
⚡Sharp SequenceLevel 7–9 (9–11 tiles)
🎯Getting GoodLevel 4–6 (6–8 tiles)
👀Getting Warmed UpLevel 3 (5 tiles)
🌱Just StartingLevel 1–2 (3–4 tiles)

About this challenge

Visual Memory tests where tiles were — order doesn’t matter. Sequence Memory tests both where and when — you must tap tiles back in the exact order they lit up.

Your score is the highest level you cleared. Each level adds one more tile to the sequence. The higher the level, the longer the sequence you successfully remembered and replayed.

Each level adds one more step AND the grid grows bigger every 3 levels. The sheer length of the sequence is what makes higher levels tough.

Nowhere. Your scores are saved only in your browser, on your own device.

Focus Hard

Stroop Colour Challenge

A colour word appears — but it's written in a different ink colour. Pick the ink colour, not what it says. Easy to understand, hard to do. How far can you go?

How to play
01
Read the ink colour
A word appears in coloured ink. Ignore what the word says — pick the colour you see.
02
Tap before time runs out
Each round has a time limit — 4 seconds early on, 3 seconds mid-game, 2.5 seconds from level 7. More colour options as you progress.
03
Levels get sneakier
More colour options, faster time, 100% mismatched words. Your brain fights harder every level.
04
Challenge your friends
Share your scorecard. Invite them to top your level. Can they beat you?
Level 1 4 colours | 4.0s per round
RED
↑ the ink is orange, not red
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The Stroop Scale
🚀Colour OracleLevel 13+ (7 colours)
🏆Brain OverrideLevel 10–12 (7 colours)
⚡Ink SharpLevel 7–9 (6 colours)
🎯Getting ControlLevel 4–6 (5 colours)
👀Warming UpLevel 3 (4 colours)
🌱Just StartingLevel 1–2 (4 colours)
Memory Medium

Verbal Memory Challenge

A word appears. If you've seen it before in this game — at any level — tap SEEN. If this is the first time it's appeared, tap NEW. Your word bank never resets between levels. One wrong answer and it's over.

How to play
01
A word appears
Read it. Has this exact word appeared at any point since you started the game? Or is this the first time?
02
SEEN or NEW?
Tap SEEN if you've seen it before in this game — even if it was three levels ago. Tap NEW only if this is its first appearance ever.
03
One wrong ends it
Miss one and the game is over. Clear 10 in a row to advance. Your word bank never resets — it only grows.
04
Challenge your friends
Share your scorecard. Invite them to top your level. Can they beat you?
Level 1 No timer | bank starts empty
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The Verbal Memory Scale
🚀Lexical LegendLevel 13+ (~100+ words)
🏆Word VaultLevel 10–12 (~77–97 words)
⚡Sharp RecallLevel 7–9 (~54–72 words)
🎯Solid MemoryLevel 4–6 (~30–48 words)
👀Warming UpLevel 3 (~24 words)
🌱Just StartingLevel 1–2 (~12–18 words)

About this challenge

Your score is the highest level you cleared. Each level needs 10 correct answers. Every level starts with a completely fresh word bank. The difficulty ramps through harder words at higher levels.

SEEN means you’ve seen this word at any point in the current game. NEW means it’s appearing for the first time this game. Your word bank grows the entire game and never resets — a word from level 1 will always be SEEN if it appears again in level 5.

Your word bank never resets. By level 5 you’re tracking 40–50 words in your head. By level 9 you’re holding 80+. The words also get trickier — later levels introduce pairs like FORM/FROM or DESERT/DESSERT that look nearly identical.

Yes. Build a mental story or image for each word as it appears rather than trying to hold a flat list. The bank grows all game — the more vividly you encode each word when it first appears, the easier it is to recognise it later.

Deep Thinking Medium

6×6 Number Grid Challenge

Fill the 6×6 grid so every row, column, and 2×3 box contains the numbers 1–6 exactly once. 3 mistakes and the game is over. Puzzles get harder every level — how far can you go?

How to play
01
Select a cell
Tap any empty cell to select it. It highlights in orange.
02
Enter a number
Tap 1–6 on the pad below the grid. Wrong entries count as mistakes and strike out a 💥 at the top of the grid — 3 mistakes ends the game.
03
Complete the grid
Fill every cell correctly to clear the level. Three wrong entries ends the game — your score is your last cleared level.
04
Challenge your friends
Share your scorecard. Invite them to top your level. Can they beat you?
Level 1 Easy | 10 empty cells
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The Grid Scale
🚀Grid MasterLevel 10+ (12 digits)
🏆Expert SolverLevel 7–9 (35–45 patterns)
⚡Sharp SolverLevel 6
🎯Logical MindLogical Mind
👀Getting Warmed UpSharp Solver
🌱Just StartingLevel 1–2 (4–5 numbers)

About this challenge

Same rules as standard Sudoku but on a 6×6 grid with numbers 1–6. Every row, every column, and every 2×3 box must contain each number exactly once.

Levels 1–3 are Easy — 8–10 empty cells. Levels 4–6 are Medium — 14–16 empty cells. Level 7 onwards is Hard — 20+ empty cells requiring multi-step deduction.

Entering a number that conflicts with the correct solution counts as a mistake. Three mistakes ends the game immediately. Erasing a wrong number does not restore a mistake.

Start with rows, columns, or boxes that already have the most numbers filled in. Look for cells where only one number can possibly go.

Deep Thinking Hard

9×9 Number Grid Challenge

Fill the 9×9 grid so every row, column, and 3×3 box contains numbers 1–9 exactly once. 3 mistakes ends the game. Levels escalate from easy to expert.

How to play
01
Select a cell
Tap any empty cell to select it. It highlights in orange.
02
Enter a number
Tap 1–9 on the pad below the grid. Wrong entries count as mistakes and strike out a 💥 at the top of the grid — 3 mistakes ends the game.
03
Complete the grid
Fill every cell correctly to advance. Three wrong entries ends the game — your score is your last cleared level.
04
Challenge your friends
Share your scorecard. Invite them to top your level. Can they beat you?
Level 1 Easy | 30 empty cells
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The Grid Scale
🚀Grid MasterLevel 10+ (50+ patterns)
🏆Expert SolverLevel 7–9 (35–45 matrices)
⚡Sharp SolverLevel 6
🎯Logical MindLogical Mind
👀Getting Warmed UpLevel 3
🌱Just StartingLevel 1–2

About this challenge

The classic puzzle. Fill a 9×9 grid so every row, every column, and every 3×3 box contains the numbers 1–9 exactly once. Each puzzle has a unique solution.

Levels 1–3 are Easy (30–34 empty cells). Levels 4–6 are Medium (36–40). Level 7 onwards is Hard to Expert (42+ empty cells).

Entering a number that conflicts with the correct solution — even if it doesn’t visibly conflict with the current board. Three mistakes ends the game immediately.

Start with the most constrained rows, columns, or boxes. Look for cells where only one number can go. Scanning for where a specific number must appear in each row, column, and box is very effective.

FocusMedium

Zone Sort Challenge

A number appears. Is it high or low? Odd or even? Tap the correct colour zone instantly. Early levels use odd/even. Later levels switch to primes, then divisibility rules. The rule is always shown — the challenge is speed.

How to play
01
Learn the zones
Four colour zones appear. Each zone is defined by two rules: one on the X-axis (odd/even or divisibility) and one on the Y-axis (high vs low — the cutoff is shown each level).
02
A number appears
A number flashes on screen. Classify it instantly — is it high or low? Does it fit the X-axis rule or not?
03
5 correct = next level
Clear 5 in a row to advance. The X-axis rule changes each level — getting progressively harder.
04
Challenge your friends
Share your scorecard. Invite them to top your level. Can they beat you?
Level14 Zones
Four colour zones. Each defined by two rules. A number appears — tap the right zone. Fast.
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The Sort Scale
🚀Zone MasterLevel 10+ (expert divisors)
🏆Sharp ClassifierLevel 7–9 (hard divisors)
⚡Quick SorterLevel 5–6 (divisibility)
🎯Getting FastLevel 3–4 (primes)
👀Warming UpLevel 2 (odd/even)
🌱Just StartingLevel 1 (odd/even)

About this challenge

Your score is the highest level you cleared. Each level uses a harder sorting rule. The higher the level, the more complex the number property you can evaluate under time pressure.

Early levels sort by odd/even. Later levels add primes, then divisibility rules. The time limit also tightens as you progress.

For divisibility: divisible by 3 if digits sum to a multiple of 3. Divisible by 4 if last two digits are divisible by 4. Knowing quick mental shortcuts saves significant time at higher levels.

Nowhere. Your scores are saved only in your browser, on your own device.

FocusHard

The Opposite Challenge

See odd? Tap even. See a prime? Tap not prime. See positive? Tap negative. See a vowel? Tap consonant. The rule is the same every time — do the opposite. Your instinct will fight you on every single one.

How to play
01
One rule only
Always tap the opposite. Odd → Even. Prime → Not Prime. Positive → Negative. Vowel → Consonant. True equation → tap False.
02
A stimulus appears
A number, letter, or equation appears. Identify what type it is — then tap its opposite from the buttons shown.
03
Beat the clock
A timer counts down each round. 5 correct advances you — later levels add more types. One wrong or timeout ends the game.
04
Challenge your friends
Share your scorecard. Invite them to top your level. Can they beat you?
Level1Odd/Even | 5.0s
Odd → Even. Prime → Not Prime. Positive → Negative. Always do the opposite.
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The Control Scale
🚀Instinct MasterLevel 10+ (+ equations)
🏆Sharp OverrideLevel 7–9 (+ vowels)
⚡Good ControlLevel 5–6 (+ pos/neg)
🎯Getting ThereLevel 3–4 (+ primes)
👀Warming UpLevel 2 (odd/even)
🌱Just StartingLevel 1 (odd/even)

About this challenge

Your score is the highest level you cleared. Each level adds a new type of “opposite” to override. The higher the level, the more types of instinct you can suppress simultaneously.

Early levels only use odd/even opposites. Later levels add positive/negative, vowel/consonant, and equation true/false — all mixed together. Your brain has to switch suppression strategies rapidly.

Your automatic response fires before your deliberate one. This is normal — it’s the whole point of the challenge. With practice you build faster inhibitory control.

Nowhere. Your scores are saved only in your browser, on your own device.

Deep Thinking Medium

8 Puzzle Challenge

Eight numbered tiles, one empty space. Slide tiles into the correct order. No timer — pure logic and planning. Each level is scrambled more deeply than the last.

How to play
01
Tap a tile to slide it
Only tiles adjacent to the empty space can move. Tap a tile to slide it into the gap.
02
Reach the goal
Get all tiles into this order: 1 2 3 / 4 5 6 / 7 8 _. The empty space must end up bottom-right.
03
Levels get harder
Each level is scrambled more deeply — early levels need ~10 moves, hard ones need 40+. No move limit.
04
Challenge your friends
Share your scorecard. Invite them to top your level. Can they beat you?
Level 1 Easy | ~10 moves to solve
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The Puzzle Scale
🚀Puzzle MasterLevel 10+ (Expert, 50+ moves)
🏆Deep ThinkerLevel 7–9 (Hard, 34–42 moves)
⚡Sharp PlannerLevel 5–6 (Medium, 26–30 moves)
🎯Getting GoodLevel 3–4 (Medium, 18–22 moves)
👀Warming UpLevel 2 (Easy, ~14 moves)
🌱Just StartingLevel 1 (Easy, ~10 moves)

About this challenge

A classic sliding puzzle with 8 numbered tiles on a 3×3 grid. You slide tiles into the single empty space to rearrange them into order. Surprisingly deep once scrambling increases.

Each level starts from a position scrambled further from the solution. Level 1 is about 10 moves from solved. By level 10 it’s 50+ moves deep — requiring careful multi-step planning.

Solve the top row first, then the left column, then work through the remaining sections. Working region by region is far more effective than random sliding.

Yes. Every puzzle is generated by making random valid moves from the solved state — so it’s always solvable.

Deep Thinking Medium

Pattern IQ Challenge

A number sequence appears. Spot the pattern and pick the next number from four choices. One wrong answer ends it. Patterns start simple and grow into multi-step rules. How far can your mind go?

How to play
01
Read the sequence
A series of numbers appears. Study them — there's always a logical rule connecting them.
02
Find the pattern
What's the rule? Addition, multiplication, alternating steps, doubling gaps? Each level introduces harder patterns.
03
Pick the next number
Choose from 4 options. 5 correct advances you. One wrong answer ends the game — your score is your highest level.
04
Challenge your friends
Share your scorecard. Invite them to top your level. Can they beat you?
Level 1 Multiple patterns | 5 questions
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The IQ Scale
🚀Pattern GeniusLevel 10+
🏆Pattern EliteLevel 7–9
⚡Sharp MindLevel 5–6 (25–30 matrices)
🎯Pattern SpotterLevel 3–4 (15–20 matrices)
👀Getting WarmLevel 2 (+/−, 4 steps)
🌱Just StartingLevel 1 (+/−, 4 steps)

About this challenge

Early levels use simple arithmetic progressions. Mid levels introduce multiplication and Fibonacci-style sums. Hard levels use alternating rules and multi-step transformations.

5 correct answers clears a level. One wrong answer ends the game immediately. Your score is the level you reached.

Look at the differences between consecutive numbers first. If the differences are constant it’s arithmetic. If they grow, check if they’re multiplying. If neither works, check if every other number follows its own rule.

Nowhere. Your scores are saved only in your browser, on your own device.

Memory Challenge Hard

Chimp Memory Challenge

Numbers flash briefly on a grid then disappear. Tap the squares back in order from 1 upward. Simple to understand — surprisingly hard to master. Each level adds one more number. How far can you go?

How to play
01
Numbers appear
Numbers 1 to N appear randomly on the grid. Study their positions quickly — they disappear after a moment.
02
Tap in order
Once the numbers vanish, tap the blank squares in order from 1 upward. You must remember where each number was.
03
Each level adds a number
Level 1 has 4 numbers. Each level adds one more. The grid also grows to fit them all.
04
Challenge your friends
Share your scorecard. Invite them to top your level. Can they beat you?
Level 1 4 numbers | 3×3 grid
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The Chimp Scale
🚀Chimp ChampionLevel 12+ (15+ numbers)
🏆Primate TierLevel 9–11 (12–14 numbers)
⚡Sharp RecallLevel 7–8 (10–11 numbers)
🎯Above AverageLevel 5–6 (8–9 numbers)
👀Warming UpLevel 3–4 (6–7 numbers)
🌱Just StartingLevel 1–2 (4–5 numbers)

About this challenge

The Chimp Test was made famous by research showing chimpanzees outperform humans at short-term number memory. Numbers flash on screen, then get covered. This challenge lets you see how you compare.

Your score is the highest level you cleared. Each level adds one more number to remember in order. The higher the level, the more numbers you successfully recalled.

Yes — the key is photographic memory of the layout. Try to memorise the positions of all numbers at once rather than reading them sequentially. With practice your spatial recall improves significantly.

Nowhere. Your scores are saved only in your browser, on your own device.

Speed Challenge Medium

Rapid Comparison Challenge

Two numbers appear side by side. Are they the same or different? Tap as fast as you can. Numbers get longer and the timer gets shorter every level. Pure processing speed under pressure.

How to play
01
Two numbers appear
Two numbers are shown side by side. They may be identical or differ by one digit somewhere.
02
SAME or DIFFERENT?
Tap SAME if both numbers are identical. Tap DIFFERENT if they differ in any way — even one digit.
03
Gets harder fast
Numbers get longer and the timer shrinks. At high levels you're scanning 10+ digit numbers in under 2.5 seconds.
04
Challenge your friends
Share your scorecard. Invite them to top your level. Can they beat you?
Level 1 4 digits | 5s timer
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The Speed Scale
🚀Scanner EliteLevel 10+
🏆Sharp EyesLevel 7–9
⚡Quick ScannerLevel 5–6
🎯Getting FastLevel 3–4
👀Warming UpLevel 2
🌱Just StartingLevel 1

About this challenge

Your score is the highest level you cleared. Each level increases the number of digits you’re comparing under time pressure. The higher the level, the longer the numbers you can compare accurately.

Each level adds more digits to compare and reduces the time allowed. Early levels give you 4 seconds with 4-digit numbers. Hard levels give you 2.5 seconds with 12-digit numbers.

Don’t read every digit. Scan from left to right and stop the moment you find a difference. The first differing digit from the left determines which number is larger.

Nowhere. Your scores are saved only in your browser, on your own device.

Deep Thinking Medium

Matrix Reasoning Challenge

A 3×3 grid of shapes — one cell is missing. Study the patterns across rows and columns. Pick the correct missing piece from 4 options. One wrong answer ends it.

How to play
01
Study the grid
A 3×3 grid appears with the bottom-right cell missing. Look at how shapes change across each row and down each column.
02
Find the rules
There is always a consistent rule — shape, size, colour, or count may change in a pattern. Find it before picking.
03
Pick the missing piece
Choose from 4 options. 5 correct advances you. One wrong answer ends the game — your score is your highest level.
04
Challenge your friends
Share your scorecard. Invite them to top your level. Can they beat you?
Level 1 Single rule
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The Reasoning Scale
🚀Pattern MasterLevel 10+
🏆Sharp ReasonerLevel 7–9
⚡Good LogicLevel 5–6
🎯Getting ThereLevel 3–4
👀Warming UpLevel 2
🌱Just StartingLevel 1

About this challenge

Your score is the highest level you cleared. Each level uses harder matrix rules involving shape, colour, size, and count. The higher the level, the more complex the abstract reasoning you’ve demonstrated.

Early levels use single rules. Later levels combine multiple rules simultaneously — shape, colour, size, and count all changing at once across rows and columns.

Scan each row and column for what changes and what stays constant. Eliminate options that violate any single rule — the correct answer must satisfy all rules simultaneously.

Nowhere. Your scores are saved only in your browser, on your own device.

Deep ThinkingHard

Mental Arithmetic Challenge

A starting number appears, then operations one at a time. Hold the running total in your head — no writing, no calculator. Pick the correct answer from 4 options. Each level adds more steps.

How to play
01
Remember the start
A number appears. Hold it in your head — this is your starting value.
02
Apply each operation
Operations appear one at a time: +, −, ×, ÷. Update your running total after each one. Don't lose track.
03
Pick the final answer
4 options appear at the end — tap the correct total. 5 correct advances you. One wrong ends the game.
04
Challenge your friends
Share your scorecard. Invite them to top your level. Can they beat you?
Level14 steps | +/−
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The Arithmetic Scale
🚀Human CalculatorLevel 10+
🏆Mental Math ProLevel 7–9
⚡Sharp ArithmeticLevel 5–6
🎯Getting SharpLevel 3–4
👀Warming UpLevel 2
🌱Just StartingLevel 1

About this challenge

Your score is the highest level you cleared. Each level has longer chains and harder operations. The higher the level, the more complex the arithmetic you can do entirely in your head.

Early levels use addition and subtraction with short chains. Later levels add multiplication and division, use larger numbers, and extend chains to 8 steps.

Update your running total after every step rather than trying to hold the whole chain. Say the number to yourself silently as you go. Prioritise accuracy over speed — a wrong answer ends the game immediately.

Nowhere. Your scores are saved only in your browser, on your own device.