How do I make platformer physics? All i need is how to jump.

Well what I like to do is have a "gravity" variable to calculate upwards force. So when you hit "a" gravity is set to 5 or so. Then every frame you go up 5, but each frame that you're not on the ground, gravity goes down .2 or so down into the negatives. It requires ground detection, and idk the best way to do that.

Ah.

you must have velocity variables for the character and use those to move it by adding them to the coordinates every tick. Don´t forget to add friction to it or you´ll end up with sonic.. xD Make a Def called FRICTION FRIC=blabla DEF FRICTION IF PLAYERXVEL>FRIC THEN PLAYERXVEL=PLAYERXVEL-FRIC ELSE PLAYERXVEL=0 END END call FRICTION every tick then

cool cool.