PRISM: Laser Logic Puzzle

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.)