Why can't I enter the far-right white door directly?

It is a decoy visible at the start. After triggering the monster, the middle door turns black and becomes the real exit.

What do I do after the monster appears?

Dodge its charge, wait for the middle door to turn black, then return to the black door's left side and jump in.

Mr Potato level guide

hard

Trigger the monster by moving right, dodge its charge, then jump into the middle door after it turns black.

Layout: A long ground stretches from the left start to the right. A white door in the middle and another white door at the far right are visible at the start. The monster appears from the right area with an exclamation mark.
Goal: Trigger the monster event, escape the danger zone, and enter the middle door after it turns black. The far-right white door is not the real exit.
Opening: Move right from the start to trigger the monster event in the center-right area, then return to the blackened middle door and prepare to jump in.
Danger Zone: When the monster shows its exclamation mark and charges with dust, standing in its path causes a knockdown and resets to the start. Do not target the far-right white door before the black door appears.
Mechanics: The monster event turns the middle door from white to black. The black door is the final trigger zone — approach it and jump in to complete the level.

Face the danger and trigger the monster first, then watch the middle door turn black. Do not rush the far-right white door from the start.
Jump into the black door rather than just walking into it — the jump-entry action from the video is more reliable.
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 left start toward the area with the two visible doors.
Continue right until the monster appears from the right side and shows an exclamation mark.
Keep moving to let the monster complete its charge. Do not stand directly in front of it.
Watch the middle door turn into a black entrance, then move back to the left side of the black door.
Hold right and jump into the black door opening. Do not switch to the far-right white door.
Wait for the VICTORY screen to confirm Level 45 is complete.

Targeting the far-right white door from the start, missing the monster event and the black door transformation.
Standing in front of the monster when it charges with the exclamation mark, causing a knockdown and route reset.
Walking into the black door without jumping, missing the jump-entry trigger shown in the video.

Why can't I enter the far-right white door directly?
It is a decoy visible at the start. After triggering the monster, the middle door turns black and becomes the real exit.
What do I do after the monster appears?
Dodge its charge, wait for the middle door to turn black, then return to the black door's left side and jump in.