PRISM

Thirty seconds and you know the game

Real gameplay. No sound.

There is only one rule

Tap a piece and it turns 90°; the light finds a new path instantly. Light every crystal with exactly the color it asks for, all at once, and the board is solved. That is the only rule, and there is no manual. The levels teach it.

• 240 puzzles across six chapters
• Every puzzle has exactly one solution
• The par shown is the true minimum, found by exhaustive search
• No ads · no in-app purchases · no sign-up
• No networking at all. Fully offline

Six chapters

The levels teach optics in order. Each chapter introduces exactly one new piece.

1. I Reflect a mirror turns light by 90 degrees
2. II Split a half-silvered mirror passes light and reflects it at the same time
3. III Disperse a prism splits white light into red, green and blue
4. IV Mix two beams meeting at one crystal make a new color
5. V Refine a filter keeps only the component you want
6. VI Converge everything you have learned meets on one board

Real optics

The angle of reflection, dispersion through a prism, and additive color mixing are real physics. Each chapter opens a principle card that shows the board before and after a single tap, side by side, written so a child can follow it. Where the game simplifies real physics, we say so.

Playable without seeing color

Every crystal also shows its required color as a shape, and mixed colors show their component shapes side by side: a yellow crystal carries a triangle and a square together. All 240 puzzles can be finished without distinguishing color.

• red = triangle
• green = square
• blue = circle

• Text size can be set to normal, large or extra large
• Turning on Reduce Motion cuts down the effects
• A tap that misses a piece by a little still rotates the nearest one

Four languages

Korean, English, Japanese and Simplified Chinese. Follows your device language, or pick one in Settings.

Questions people ask