It's very easy if you have patience and skill but here are the tips: If containment's bone throw spawns it's very much recommended to stay away and use dash, once you dodge those bones don't use dash. (2:38,2:20) The 4-5 Gaster blasters are easy to dodge, use dash, find a safe spot and stay away from where those blasters were aiming (2:49,3:46) if it's the combo (2x Blasters atk + Bone throw) use dash wisely, how? easy when you're at the safe spot save your stamina for dash and stay away from containment till the blasters and bone attacks are over. (4:27) The Containment hands aren't a big problem, if it's about to hit you, use dash immediately. (4:44) About Containment's white void when you hear this noise (4:48) it means he is going to spawn his white void below himself, it's recommended to wait till that thingy stop spawning or you could do this (4:58) it's risky Tho. Containment's void is easy to dodge just pay attention to the void where it's about to spawn (5:18) btw if the voids are about to spawn and you're near Containment sans (where the void is about to spawn) don't hit him just stay away from those voids. the bone zone is simple to dodge, just use dash to quickly get out of the zone. reminder to use pies when you're below 30 hp. Now phase 2 (9:29) The spinning bones are easy to dodge use dash, once the bone is out of your way, don't use dash, save it, it's very important. now for this attack (10:16) just jump over those bones with dash. (10:19-10:28) when that big blaster is about to fire use dash immediately and find a safe spot, the attacks are much difficult as you progress, but I bet you could comprehend them all. hope this tip works.
