It's Simon Says, but panels use geometric patterns (solid, hollow, grid, stripes, diamonds, dots) instead of colors. All monochrome. You can't shortcut it by remembering "the red one" — you have to remember shapes. Each panel also has a distinct audio pitch for multi-sensory memory.
Difficulty is layered: 4 of 6 panels are active initially. The 5th unlocks at round 8, the 6th at round 15. Speed only ramps after all 6 are in play. Early rounds build familiarity, late rounds destroy it.
Same rule as the other four games (typing, aim, rhythm, bullet-hell dodge): every player faces the exact same deterministic sequence (seeded PRNG). You race against the leader's ghost replay on the identical challenge. Leaderboards are pure skill.
Weekly season resets — Season 3 boards are empty across all five games. Free, no account, browser-based.