It is by far the shortest island. Future maps usually have three main levels - you'll alternate between three main levels and four levels with a boss waiting for you at the end. There's no boss here, but soon we'll be entering the messed up timeline and jumping into a post-apocalyptic future. This is where the game starts to get difficult.
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1-2: Peak of N. Sanity | All crates and hidden gems
28/86: All 28 are very simple. They are on the main path. Just make sure you trigger any TNT crates you come across. This set of crates is all the way to the bonus room.
40/86: 12 boxes are in the bonus room. To complete it, use the slide jump to get over the wall of the metal crate, then bounce off the crate above the TNT crate to reach the top ledge before it explodes.
44/86: There are 4 crates on the path leading to the room with 9 platforms.
50/86: There are 6 crates in the 3 × 3 platform room. Carefully time your jumps as they turn into reality to get them all.
Red gem: The Red Jewel can be found in the room of the 3 × 3 platform. Start at the lower left corner and jump right, right, up, up, left, left, down and right to make the red gem appear.
58/86: After collecting your first mask, you will have to flee from a giant ghost. There are 8 crates along this path, ending with the checkpoint crate.
Hidden gem: The hidden gem is on the left after the first crate. Die and start over if you miss it!
69/86: 11 other crates can be found along the second ghost hunting sequence.
86/86: The last crates are in the ghost hunt. Make sure you're quick enough so you have time to smash the large collection of crates at the very end of the chase.