Brain Training Games

Free science-inspired mini games for memory, attention, mental math and reaction speed. Play instantly in your browser — on your phone or your computer.

Start training

How to play

  1. The dark shape is made from all seven pieces. Fill it exactly — no gaps and no overlaps.
  2. Drag a piece from the tray onto the shape. It clicks into place when it fits.
  3. Tap a piece to give it a quarter turn. Tapping the parallelogram also flips it over.
  4. Any arrangement that fills the shape counts, even if it differs from the dashed lines.
  5. Each shape filled without a hint makes the next one harder: fewer dashed lines, then only the outline, then tighter and tighter shapes. Hint places one piece for you. Five shapes make a session.

All brain training games

Memory

Memory Match

A free online memory game — flip the cards and match every pair.

Play → Attention

Schulte Table

Find numbers 1–25 in order as fast as you can.

Play → Math

Quick Math

Solve as many sums as you can in 60 seconds.

Play → Reaction

Reaction Time

Tap the moment the screen turns green.

Play → Memory

Number Memory

Remember a number that grows one digit each round.

Play → Memory

Grid Memory

Memorize the lit tiles and tap them back.

Play → Memory

Who’s Home?

Watch who walks into the little house and who walks out, then say how many are still inside.

Play → Attention

Quick Glance

A critter flashes on the stump and its twin in a bush, then both hide. Tap where the twin was.

Play → Spatial

Snug Fit

Every piece in the tray has been turned. Tap the one that fills the gap in the wall.

Play → Logic

Water Sort

Pour the colors into separate bottles, one satisfying move at a time.

Play → Logic

Nonogram

Read the row and column clues to uncover a hidden pixel picture.

Play → Attention

Sort Shift

Toys roll down the belt. Sort each one by colour, shape or size, as the sign says right now.

Play → Logic

Trios

Pick three cards where colour, shape, number and shading are each all the same or all different.

Play → Spatial

Tangram

Seven flat pieces and one dark shape. Drag them on, tap to turn, and fill it with no gaps.

Play →

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Why brain training?

Your brain loves a challenge. Short, focused exercises — remembering positions, finding numbers, doing quick math — engage memory, attention and processing speed, the core skills you use every day at work and at school.

JuJu Games keeps every workout under a few minutes, tracks your personal bests on your device, and gets better every week thanks to player feedback. No account, no install, no paywall.

Frequently asked questions

Are these brain games really free?

Yes. Every game is free to play in your browser, with no account or installation required.

Do the games work on mobile phones?

Yes. Every game is designed for both touch screens and desktop, and adapts to any screen size.

How often should I train?

Short and regular beats long and rare: a few minutes a day across different games (memory, attention, math, reaction) is a great routine.

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