osu!mania
Osu mania - it is a mode of osu! and is a VSRG it has a lot of keys, keys are abbreviated as K, 1K, 2K, 3K, 4K, 5K, 6,K, 7K etc...
Person 1: omg what are you playing how do you do that!!!!
Person 2: its called osu!mania it is a mode of osu!, and in order to do it you need to press the keys on your keyboard.
Person 1: *Insert crying emoji* BUT TELL ME HOW!
Person 2: I already told you.