When your adrenaline meter reaches 100, you can use these combos: 4x forward: Speed (greatly enhances running speed, but drains adrenaline fast). Marked with yellow trails from your legs.

4x backward: Booster (rapid health regeneration; if you reaches 199 health, it regenerates your armor up to 150. Afterwards, it does nothing). Marked with green crosses around you.

2x left, 2x right: Invisibility (self-explaining).

2x forward, 2x backward: Berserk (weapons does higher damage). Marked with red shell around you.

In instant action matches, there are 2 extra combos enabled by a mutator and invoked by 4x left /4x right. The Quad Jump(mutator), although it is four keyed, does not count a combo.

All the combos listed here are built-in gameplay elements, thus they do not count as cheating, so feel free to use (or don't use) them, although the console cheats prevents unlocking Malcolm and Xan for non-Tournament matches.