//jump
if place_free(x,y+1) {gravity = 0.5}
else {gravity = 0}
gravity_direction = 270 
//set jump speed
if vspeed > 10 {vspeed = 10}
//move left & right 
if keyboard_check(vk_right) && place_free(x+4,y) {x+=4}
if keyboard_check(vk_left) && place_free(x-4,y) {x-=4}
/jump key
if keyboard_check_pressed(vk_up) && !place_free(x,y+1) {vspeed = -8}