# Shadoku — Colored-light logic puzzles

> Colored-light logic puzzles (iPhone/iPad app by Andrew Lin.)

- Source: https://appshunter.io/ios/app/shadoku/id6820406089 (this page in markdown: same URL + `.md`)
- Developer: [Andrew Lin](https://appshunter.io/developer/900553143)
- Category: Games, Puzzle, Strategy
- Price: $4.99
- Age rating: 4+
- Requires: iOS 15.0 · 10 MB
- Languages: American English
- Released: 2026-10-14
- Data updated: 2026-10-16

## What is Shadoku?

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.

## Is Shadoku safe?

Not enough ratings yet to assess Shadoku.

## Is Shadoku legit?

Shadoku appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Shadoku is 68 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-10-14

No release notes.

## More apps by Andrew Lin

- [KingForADay - Chat With A New King Everyday - King For A Day](https://appshunter.io/ios/app/kingforaday-chat-with-a-new-king-everyday-king-for-a-day/id929006282)
- [2016 ICD 10 Codes - Offline browse and search of 2015/2016 CM & PCS code with MEDLINE info](https://appshunter.io/ios/app/2016-icd-10-codes-offline-browse-and-search-of-20152016-cm-and-pcs-code-with-medline-info/id1020057205)

All apps by Andrew Lin: https://appshunter.io/developer/900553143

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-16.*