MM345Ghyll is a beat-timing tap game. Rhythm targets appear on a steady pulse, and tapping them in time scores points. Empty taps and off-beat taps count as mistakes, and six mistakes end the run. Targets keep arriving with the beat, so you must stay locked to the pulse instead of mashing. Rushing early or lagging late both spend the error budget. There is no hold assist to salvage a missed window. Clear target cues keep the hit moment readable as tempo pressure builds. Simple on-beat tap rules with a six-mistake fail. Great for short rhythm drills, timing focus, and retry-friendly high scores.