Z - go through text / confirm Arrow keys - Move and select Up arrow - hold to jump (Don't hold it while touching platforms or else you'll go through it, haven't been able to fix this glitch) UPDATE: Sans gravity attack is now random UPDATE: No longer take damage because of gaster ghost effect (Don't touch the box) UPDATE: Attacks have been shorten to real game time glitch UPDATE: Soul can move left right (or up and down) in each gravity
have fun don't go on the platforms to the edge of the box because you can go through the box. if you do your a cheater