Not to be confused with Combo
See also: Game modifier
The mod multiplier is one of the multipliers which affects the score value of a single hit object throughout gameplay.
By default, the mod multiplier equals to 1.00x, however, if several mods are enabled, the final value is a product of respective mod multipliers. For example, if Hard Rock and Half Time are enabled simultaneously in osu!, the final value would be 0.318x.
Score Multiplier, while in osu!(lazer) it is called Difficulty Multiplier.