Part of the StatedefYou need to specify what physics to use in that state. Valid values are "S" for stand, "C" for crouch, "A" for air, and "N" for none. To leave the physics unchanged from the previous state, use a value of "U". If omitted, the value of "N" is assumed. The kind of physics is used to determine how P1 behaves.For "S" physics, P1 will experience friction with the ground. The value for the friction coefficient is set in the Player Variables.For "C" physics, P1 will experience friction, just like in the "S" state.For "A" physics, P1 will accelerate downwards, and if his y-position is greater than 0 (ie. he touches the ground) he will immediately go into his landing state.If you use "N" P1 will not use any of these pre-programmed physics.Do not confuse "physics" with the state "type". They are usually the same, but you are given the choice if you want more control. For instance, you may choose to use "N" (no physics), and specify your own acceleration and landing detection for an aerial state.