Crash Twinsanity 3D is a game where you, as Crash, run away from the screen while avoiding obstacles. You can run in any direction (even backwards), jump, double jump, spin and belly-flop. Some levels also force you to Humiliskate (in other words, use Cortex as a snowboard with no means of turning around).
There are Wumpa Fruits to collect and explosive crates to avoid as you try to reach the goal in each level. Also present are stopwatches that trigger a Time Trial for the level you're in, just like in the good old days.