1-2 (Cave of No Return)

Map

Miscellaneous

On the first screen, while the gate is opening, switch to Purple.
When you enter as Purple, Green immediately gets moved to Purple after the transition.
From there, do one roll right and one up and you should see both Lamps.

For the GBA Room Puzzle before Shadow Link, the correct path is always "Right, Left, Right".

Gem Routing

There are 3 RNG sources:
1. Gem Fountain in Pot Room
2. Gem Rain in Keese Room
3. Shadow Link Fight

Sometimes you can get unlucky and the Gem Rain 100 in the Keese Room will fall into the void.
The final Shadow Link can drop either 100 or 150, but typically you would not want to rely on the 150 since it's at the end of the level and you are unable to go back so if you end up short on Gems you are forced to go Back in Time.

3rd Screen (after getting Lamp) => 530:
330 (using Lamp) + 100 (SL) + 100 (Chest)
Coloured Blocks Room => 830:
100 (Chest) + 200 (Chest)
Pot Room => 950+:
Gem Fountain top left (if you end up really short you can go for the 2nd Gem Fountain in the top right corner)
Keese Room => 1750+:
100 + 300(make sure you get the 300 and not the 100) + Gem Rain + Keese Drops
GBA Puzzle => 1900
when going Left, there are 50 + 100 Gems in the 2 Chests
Shadow Link => 2000

Small Key Skip

By using a Freeze Clip in the second room where the first key is obtained, it is possible to save this key and thus skip the second one.

Video

Both of the doors can also be skipped with a Pickup Clip

Block Room Timesaver

It is possible to move the 2x2 blocks in unintended directions, which leads to a small shortcut in the third room with the blocks.

For the first block, position the links above it, to the left, and then press C-Up and simply move left.
For the second block (the last one), press C-Down and wiggle the controlstick between up and right.