All games

~4 min · Verbal working-memory span

Digit Span

Repeat digit sequences forward, then backward.

~5 min · Working-memory updating

N-Back

Spot letters that match the one N steps back.

~4 min · Visuospatial working memory

Corsi Blocks

Tap blocks in the order they lit up.

~3 min · Verbal recognition memory

Word Recognition

Seen it before, or new? Keep going until three mistakes.

~5 min · Working-memory updating under dual load

Dual N-Back

Track positions and spoken letters N steps back, at the same time.

~6 min · Working-memory capacity

Operation Span

Check equations while holding a growing list of letters.

~5 min · Visual associative memory

Paired Associates

Remember which box hid which pattern.

~4 min · Working-memory manipulation

Letter-Number Sequencing

Reorder a mixed sequence: digits ascending, then letters A–Z.

~4 min · Visual working-memory capacity (K)

Change Detection

A flash of colors, a pause: did the marked square change?

~6 min · Episodic verbal memory and learning

Free Recall

Learn a 15-word list, then recall it after a distraction.

Mental arithmetic

10 games

~2 min · Arithmetic fluency

Speed Arithmetic

Two minutes of + − × ÷. Answers submit themselves.

~4 min · Processing speed, working memory and sustained attention

Paced Addition

Add each digit to the one before it, as the pace speeds up.

~2 min · Mental subtraction with working memory

Serial Subtraction

Count down by 7s, then 13s, then 17s.

~3 min · Approximate number system acuity

Number Sense

Which cloud has more dots? No time to count.

~4 min · Arithmetic under working-memory load

Number Chain

Carry a number through a growing chain of operations.

~6 min · Arithmetic problem solving and planning

Target Number

Combine six numbers with + − × ÷ to hit a three-digit target.

~5 min · Numerical inductive reasoning

Number Series

Find the hidden rule and give the next number.

~5 min · Multi-step mental computation

Mental Multiplication

47 × 86 in your head. No paper.

~5 min · Multi-step calculation with modular arithmetic

Calendar Math

What weekday was a given date? Compute it.

~4 min · Arithmetic reasoning and search

Missing Operators

7 ? 3 ? 2 ? 4 = 23. Fill in the operators.

Speed & attention

10 games

~2 min · Simple and choice reaction speed

Reaction Time

Hit the moment it turns green, then pick the lit target.

~3 min · Inhibition (interference control)

Stroop

Name the ink color, not the word. Then the rule flips.

~2 min · Processing speed

Symbol-Digit Coding

Translate symbols to digits with a key, for 90 seconds.

~2 min · Selective attention and interference control

Flanker

Which way does the middle arrow point?

~3 min · Sustained, divided visual attention

Multiple Object Tracking

Follow the targets as identical dots swarm.

~4 min · Response inhibition (stop-signal reaction time)

Stop-Signal

Respond fast, unless the arrow turns red.

~3 min · Sustained attention (vigilance)

Rapid Visual Processing

Catch 3-5-7, 2-4-6 and 4-6-8 in a fast stream of digits.

~3 min · Attention and visual scanning efficiency

Visual Search

Is there a T hidden among the Ls?

~3 min · Divided attention and processing speed

Useful Field of View

A glimpse in the center and the periphery at once.

~3 min · Sustained attention and alertness

Vigilance (PVT)

Three minutes of waiting and reacting. Lapses count.

Reasoning & flexibility

10 games

~3 min · Processing speed and set-shifting

Trail Making

Connect 1→25, then alternate 1→A→2→B…

~3 min · Spatial visualization

Mental Rotation

Same shape rotated, or its mirror image?

Tower of London

Rearrange the balls to match the goal in the fewest moves.

~6 min · Planning

~3 min · Cognitive flexibility (switch cost)

Task Switching

Odd or even? High or low? The color decides.

~10 min · Fluid intelligence (abstract reasoning)

Matrix Reasoning

Complete the 3×3 pattern grid.

~4 min · Set-shifting and rule learning

Card Sorting

Find the hidden sorting rule, and notice when it changes.

~2 min · Verbal reasoning speed

Grammatical Reasoning

“B is not preceded by A.” AB: true or false?

~5 min · Deductive reasoning

Odd One Out

Eight items share a hidden rule. Find the one that breaks it.

~6 min · Hypothesis testing and deduction

Code Breaker

Deduce a hidden 4-color code from feedback.