arrow keys to move JIKL to move sans Z - Bone X - Gaster Blaster C - Blue bone V - Orange bone 1 - turn rapid fire off 2 - turn rapid fire on (in case you're too lazy to continuously mash buttons XD) Space - Attack (you must be on the button) H - Healing peg B - Blue Gaster Blaster N - Orange gaster blaster M - Tricky Blaster A - Bone wall covering fight button 3 - Cheats Click on the screen - Teleport heart
all credit goes to @thelugiduck2 this is not impossible just wait till he gets tired after you already damaged him damaging him after you already damaged will do nothing