Basic rundown of the hardest rooms to get used to:
1. In the room with the breakable wall: line up with the top of the second "X" pattern on the wall. Do a neutral and buffer jump, and hold right to grab the other side of the wall. Get the dash crystal for stamina if you want. Then, on the wall to the right of that, line yourself up on the bottom line of the first tile. Jump and hold right and buffer another jump to make it to the end of the room.
2. In the room right after: after falling to the platform, get your way onto the wall and neutral jump twice for stamina. Line yourself up with the second dark line to the ceiling, hold right, and (with your two jump buttons hopefully) quickly jump twice and hold right to make it to the wood platform (I totally messed that up lol but somehow made it haha).
3. In the room after the "Are You Beach Ready" sign room: Hold grab and walk straight into the little space where wall is, as you see in the video. Jump almost immediately after hitting it and grab the right wall, then fall left and grab that wall. Hold right and jump then buffer another jump on the edge of the spikes on the tall right platform. You will hopefully make it to the crumbling stone ground if you were high enough up on the left part of the wall. Immediately jump up to the little wood platform, then jump right to the rightmost wall.
4. In the room where the floor is all spikes with the wood platform on the wall on the right: Grab the left upper corner of the place you start from, hold right and jump from there and buffer another jump to land on the wall where the spikes nearly meet, and buffer another jump off there to make it to the wall. Neutral until you get to the wood platform. Observe in the video where I grab onto the wall specifically where those white dots are, hold left and fall, buffer jump off the platform then buffer another jump in the corner with all the spikes to make it to the grey platform. Jump and grab the left wall and carefully fall onto the last part of the wall near the bottom. You will be lined up with your next jump, in which you fall and jump immediately upon hitting that corner as you see in the video. Grab the leftmost wall and get up to the next room.
5. In the very next room: use the spring to get up that wall and grab onto the moving block on your right. Get up to the very top of it. When it starts moving down just a little, with full height jump left to hit the crumbling stone platform then immediately buffer jump off of that to reach the corner near the spikes, then buffer jump off of that to not die to it.
6. In the room right after that: get up onto the little platform right in front of you. Grab the bit of wall so that you are wedged in that corner space. Jump right and buffer a jump of the spike corner then grab the wall near the grey platform and jump to the grey platform. With enough energy, then jump to the left tall wall and get to the mini wood platform. Climb up to the top middle platform with the falling block and grab hold of that falling block. As the video shows, as long as you line yourself up with the big mass of white pixels, you can let the block fall to the ground, then jump right and buffer a jump off the corner with the spikes to make it to the end of that room.
7. In the room right after that (final room): Use the spring to get to the moving block, then use it to get to the rightmost wall. You can either conserve as much stamina as possible by only doing neutral jumps up the wall until around the fourth group of white pixels as you see in the video and attempting to go for the next moving block by moving towards it and holding grab, and if it doesn't work, just get back to the wall, and keep neutral jumping and try again. Alternatively, you can neutral up the wall until that group of white pixels fourth from the top group and attempt to jump from there, but I find it to be pretty precise and you may only get about three chances to do so if you go that route before losing stamina. Once you get to the final jump at the top of the room, with the wood platforms, you will need to use coyote time and jump just a bit after you step off the first wood platform. You do it right and you will practically be jumping on air. Challenge complete!
(Also excuse my wobbly movement in this run I didn't expect to make it even close to the end and I was tired lmao)