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
Credit to @Spacer789 Street Cred To @angels55
