Watch which crystal lenses light up. Repeat all signals in exactly the same order. After a successful round, one new signal is added. The first wrong field ends the game.
Tap a lens or press its numbered key, 1 to 5. Inputs are enabled only during your turn. Each lens has its own color, symbol and tone.
Only fully repeated rounds count. The current sequence is one signal longer than your completed-round score. No consecutive duplicate signals and no answer time limit.
Tab selects controls; Enter or Space activates them. Number keys 1 to 5 play the matching crystal lens.
Active time begins with Start, pauses in menus, demos and the background, and stops after a mistake. Timer display defaults to off. A saved round waits for Continue.
For entertainment only. No stakes or prizes.