Hi everyone,
Just tried playing on 
https://osumania.net and I’m genuinely impressed. The game launches instantly in my browser—no download or installation needed. It’s awesome for quick rhythm-sessions during breaks. 
I opted for the 4-key mode to start and gradually switched to 7-key for a bigger challenge. The controls (D, F, J, K) feel smooth and responsive. 
As someone who enjoys music games, the ability to pick from community tracks is a genuine plus. Highly recommend if you’re looking for fun, fast reflex training that fits into any tiny time slot.