Tricks or Stunts are a valuable technique that can result in a Jump Boost. To get these short speed boosts, simply hit the R button just as you leap off a ramp, boost ramp, bump, or edge. Doing so will result in a trick animation and a Jump Boost.

There is no multiplayer. There never will be multiplayer. The developers have officially stated in the official discord chat for everyone to not bother asking about multiplayer. Y'all know it a'int a game w/o MP..

As far as the two original games go, Overcooked 2 doesn't have cross-platform multiplayer. PC players (across Epic Games Store and Steam) can play together, but that's it.