A playground for curious minds.
Classic puzzles, little math mysteries, and how everyday technology works. Small things you can start playing right away, with more to explore when you get curious.
Play
Slide & move
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Hakoiri Musume
Slide the blocks to set the big red daughter free.
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15 Puzzle
Slide the numbers back into order.
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Traffic Jam Puzzle
Shuffle the cars to let the red one out.
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Toggle Lights
One tap flips its neighbors too. Turn every light off.
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Ice Slide
Plan your stops on a slippery floor.
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Box Pusher
Push, never pull. Bring each box to a goal.
Fit the pieces
Logic puzzles
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Number Place
Find each digit’s place with logic.
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Mini Number Place
Find each digit’s place with logic.
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Black & White Grid
Two colours, a grid full of deductions.
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Nonogram
Follow the clues to reveal a picture.
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Bulb Placement
Light every cell without crossing beams between bulbs.
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Mine Logic
Every step follows from the numbers.
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River Crossing
What can you safely leave behind?
Math mysteries
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Angle Puzzles
Find the angle marked “?”.
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Tower of Hanoi
Move a smaller tower to unlock a bigger one.
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Water Jugs
Measure precisely with unmarked jugs.
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Eight Queens
Place queens so that none attack each other.
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Knight’s Tour
Visit every square exactly once with a knight.
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Bridges of Konigsberg
Can you cross every bridge exactly once?
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Magic Square
Arrange the numbers so rows, columns and diagonals share a sum.
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Circle Elimination
Standing in a circle and skipping every other person, who is left at the end?
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Hailstone Numbers
Halve it or triple it and add one. How far does a number travel?
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Prime Sieve
Pick a prime and its multiples drop away.
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Binary Cards
Six cards are enough to guess your number.