Routine Mode

Routine is a mode in Dance and Pump where 2 or more players play on both pads at once with different patterns for each player. This mode made the dance-couple mode obsolete. This mode was first introduced in SM4 alpha, where it would crash when you tried to access it in the editor.

How this mode works
Usually, in most SM versions, routine mode only supports up to 2 players, but some special modified versions of SM can support more players (example StepF2 supports up to 3 players and AMX supports up to 8). Each player is assigned different patterns they have to play, with each player having different colors (usually, P1 is blue and P2 is red/orange or vice versa depending on the noteskin). Even though this is technically a 2+ player mode, all combos for this game will count towards the entire game as it were a one player game.