Top Descriptors simple Accessible and straightforward map design. , visually dense Contains patterns where the amount of visible notes makes determining note order and/or timing difficult. , grid snap Objects are placed along a square grid, typically using osu!'s in-built grid snap feature. , bursts Patterns requiring continuous movement and alternating, typically 9 notes or less. , finger control Uses complex applications of rhythms in order to test the player's tapping ability.