Should I enter the emergency door on the left?

No. Move right past it and solve the crate interaction near the chained doors.

How do I know the door can be opened?

A yellow key appears after the crate sequence. Collect it, then use the dark opened doorway on the right.

Mr Potato level guide

hard 1 colors

Move past the left emergency door, use the wooden crate to trigger the yellow key, then enter the opened right-side door.

Layout: A single long floor has an arched emergency door at the far left, a wooden crate just to its right, and two chained arched doors farther right.
Goal: Open the right-side exit door with the crate-and-key sequence and enter the dark doorway.
Opening: Do not stop at the left emergency door; move right to the crate and chained-door interaction area.
Danger Zone: The crate and chained doors form a narrow interaction area. Missed jumps waste the setup, while pushing into a chained door before the key appears makes no progress.
Mechanics: Jumping into the crate launches it toward the chained doors; a yellow key then appears and one door opens.

The left emergency door is a decoy for this route; continue right at the start.
The yellow key confirms that the crate sequence worked; collect it before approaching the opened doorway.
Think in chain clears. The best move is the one that sets up the next two moves, not just the quickest current match.

Move right from the far-left start, passing the emergency door and approaching the wooden crate.
Use short jumps and collisions to make the crate rise and travel toward the chained doors.
Stay in the right-hand section until the yellow key appears, then collect it.
Approach the newly opened dark doorway among the chained doors.
Enter that right-side doorway to trigger victory.

Colors in this level:

Yellow

Returning to the left emergency door before completing the crate sequence misses the actual exit.
Continuing to push against a chained door when no key is visible does not open it; return to the crate.

Should I enter the emergency door on the left?
No. Move right past it and solve the crate interaction near the chained doors.
How do I know the door can be opened?
A yellow key appears after the crate sequence. Collect it, then use the dark opened doorway on the right.