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An enemy orb will appear. Memorize its assigned button. React before time runs out. One mistake and it's over.
Easy: Each orb colour always maps to the same button. Learn the mapping once and you can react instantly.
Hard: Orb colour mappings are randomised on every new game. Adapt on the fly each play‑through.
Expert: The mapping depends on both the orb's colour and its motion (pulse, spin, wobble). More combinations to remember, but consistent across games.
Ultra: Both colour and motion are used, and mappings are reshuffled every game. The ultimate challenge.