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how do i make sliding? so that on the key up event the player will slide a bit according to the velocity of
the running, dashing, attacking or jumping?

One way of doing this, if I understand what you are asking, is to; On keydown event, set the xvelocity to whatever you want, and in the draw actor script, have it decelerate: if (xvelocity>=20){xvelocity-=5;}....else if (xvelocity>=1){xvelocity-=.1;} Setting up all the intermediates that you need.

Make sure you have set the right physical response values, otherwise your actor will just stick to the ground.
(All four values one; Mass: specify, assuming that you use the PhysicalResponse action at all, that is.)