Shadoku
Colored-light logic puzzles
$4.99 · Designed for iPad. Not verified for macOS.
Bend the light. Match the shadows. Drop pieces and colored glass in a corner so the shadows on two walls match both targets. 200 levels and a new daily level.
Bend the light. Match the shadows.
Shadoku is a shadow puzzle in a daylit white room. A light shines at each of two walls, and everything you place in the corner casts a shadow on both. Drop blocks and Tetris pieces until the shadows match both dark target outlines exactly, with no shadow outside an outline and no gap inside one.
PIECES REST ON WHAT IS UNDER THEM
A piece drops like Tetris onto the highest cube beneath it, so overhangs leave gaps and light passes through them. A shadow can have a window. Every drop changes two pictures at once.
200 PUZZLES
Start with single cubes, then meet the O and I, the T, L and J, and the S and Z on a bigger floor. Along the way come stone furniture you can't pick up, a spare piece that doesn't belong in the answer, and colored glass.
GLASS THAT MIXES LIGHT
Cyan, magenta and yellow glass tint the light instead of blocking it. Colors multiply where they overlap: cyan and yellow make green, magenta and yellow red, cyan and magenta blue, and all three make shadow. Each wall cell must get exactly its color. Color patterns add stripes, dots and diagonals for players who can't tell the colors apart.
A NEW LEVEL EVERY DAY
The daily level is the same board for everyone, a 5×5 floor. It's a race against the clock, with no hints: solve it, see your time and how it compares with other players, share it, and keep your streak going. Turn on a daily reminder if you want a nudge.
HINTS WHEN YOU'RE STUCK
A hint shows one step: a piece that has to come off, or where the next one goes. A solve earns one star, and two if you didn't use a hint.
PLAY ANYWHERE
Sign in with Apple or Google to keep your stars, streak and purchases on all your devices. Signing in is optional, and the game works offline.
Ratings & Reviews
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The developer, Andrew Lin, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Andrew Lin
- Size
- 10.5 MB
- Category
- Puzzle
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Andrew Lin
