Before it was added to the game, the Headstart took it's place.
Its arrival made the highest possible multiplier to increase from 60 to 70. On Mystery Mondays, the use of the +10 Multiplier, the 2X Multiplier, and the Score Booster increases the maximum multiplier to 80.
When used, the multiplier will turn blue.
This, the 2X Multiplier and the missions are the only things in the game that can increase your multiplier.
This and the 2X Multiplier are the only power-ups in the game to not be seen held by the character when used.
This, the Mega Headstart, and the Headstart (expired) are the only powerups in the game that can be used at the start of the game by just tapping them once.