PRISM: Laser Logic Puzzle

Rotate mirrors, guide the beam through every gem, and land it in the exit. One logical solution, no luck. A quiet daily puzzle you solve with your head, not your thumbs.

Rotate a mirror. A new path of light appears. Guide the beam through every gem, then into the exit. There is always exactly one answer.

PRISM is a quiet logic puzzle built from just light and mirrors. A laser fires across the board, and rotating mirrors stand in its way. Turn each mirror to "/" or "" to route the beam so it passes through every gem, then finally reaches the exit. No luck, ever. Every board has a single solution, and pure logic will always get you there.

Start gentle, then climb. On Hard and Expert, wrong angles stay plausible for several moves before they fail — so you have to read the whole board, not just the next step. That is where the real satisfaction lives.

FEATURES

• One-tap simplicity: rotate mirrors, that's the whole control.
• Always exactly one solution — reasoning, not guessing.
• Four difficulties (8x8 / 9x9 / 10x10 / 11x11), from first steps to brutal.
• A daily puzzle and a solving streak to keep the habit.
• Fully offline — play anywhere, no signal needed.
• No account, no sign-up, no personal details.
• A calm, minimal board where the light lines up beautifully.
• English and Japanese.

GREAT FOR

• Turning a commute or a coffee break into quiet focus.
• Fans of Sudoku-style puzzles that reward logic, not luck.
• Anyone who wants to think without ads breaking the flow.
• People who like understated, minimal design.
• A gentle "one puzzle before bed" ritual.

PRIVACY & PEACE OF MIND PRISM keeps your progress — solves, streaks, times — entirely on your device. Nothing is sent to a server. No account or login is required, and we never ask for personal information. Everything works offline. (An advertising SDK may process minimal data to show ads; personalized ads are turned off.)