Combo bonuses

See also: streak bonuses

Commonly the combo bonus is a score multiplier but it can be pretty much anything.

Combos themselves cover:
* Defeating multiple opponents within small timeframe or without much pause in-petween.
* Performing combo moves.
* Hitting enemies without getting hit yourself.
* Defeating multiple opponents with single hit.
... and so forth.

The opponents and fighting terms can be replaced with things like tetris blocks and matches, and plenty of others that follow the same gameplay mechanism.