huge thanks to @RealSilGaming for making the definitive edition mod
I had been trying to complete this for a while but couldn't get past attack 3.
also here's my comment on each attack (it's not suppose to be a guide):
1st attack: not a lot to say about this one, the only "challenging" part is the beginning with the mini-jump and even that is not that bad
2nd attack (gaster blaster spam with screen flipping): this one is def the most RNG based attack with the patch, I mostly just go left and right and pray that the RNG god is watching me. I have failed quite a lot to this one (like at the start of the video)
3rd attack (small, medium and large jump with gaster blaster):
-with the patch: Very easy. You just have to instantly jump after the small bone in order to do the large one without going left and also watchout for the medium one
-without the patch: awfulawfulawfulawfulawful- too much RNG
if you wanna do the no hit without the patch, this attack will make you question your life choices.
4th attack ("random" attacks): again not much to say about this one, all mini attacks are pretty easy to do except for the last which caused me a fair share of attempts
5th attack (platforms followed by gaster blaster spam): not a hard attack:
for the platform part: everytime the bones appear, I just jump over 2 platforms to land on the 3rd one (and occasionally jump on the next right after)
and for the gaster blaster spam... It's a gaster blaster spam with a reversed screen, do I need to say more?
6th attack (idk what to call this one):
with the patch: Again very easy attack. First part is memory based aand... Okay I don't actually to say
without the patch: you're basically playing the lottery with the orange bones, sometimes they still damage you even if you're moving
7th attack (platforms with gaster blasters):
with the patch: not too bad for the most part, you just jump when the gaster blasters are about to fire and land at the start. Though I did get barely hit by the gaster blasters when falling and sometimes accidentaly started going up (like in the winning run)
without the patch: I stay down and pray yet again to the RNG gods
8th attack (diagonal bones with orange bones): by far the easiest attack to no hit, you just have to follow a very simple pattern.
9th attack ("random" attacks the sequel): It's the same story as attack 4, the only challenging one is the last one where I barely hit one of the bones multiple times, the rest isn't difficult to learn.
final attack:
1st part (gaster blaster spam): easy peasy, just go left and you'll be safe
2nd part (2 gaster blasters following you): also easy peasy, just go right and hold x to be slower
3rd part (very small bones): again, easy peasy, just do small jump, go over 2 bones, go back and repeat the proccess
4th part (reversed screen and going up and down): as long as you can do the small left jump to avoid taking damage at the end, you'll be fine.
5th part (reversed screen and going left right): I just jump over the 4 first small bones and go rght the entire time, works very well)
6th part (middle gaster blaster and spinning bone): just go to the top right corner and you'll be safe the entire duration of this part
7th part (gaster blaster circle): it's a counter clock wise gaster blaster circle, do I need to say more?
8th part (big gaster blaster):
with the patch: this is pretty interesting gaster blaster, you have to still be pretty careful and immediately switch to clock wise because this part does not work if you go counter clock wise like the previous
without the patch: I just go sideways and pray yet another time to the RNG gods, I only got through this one without getting hit a few times
if you have read everything (or are just reading this without reading my whole... I don't actually know what to call it), then I just want to tell you that you are an amazing person :)