Is falling into the gap a failure in Level 10?

No. The first fall is a trigger step. Wait for the character to return and the balloon to appear, then attempt the second crossing.

When does the balloon appear?

After the first jump and fall, a single balloon appears in the gap. It enables the second crossing attempt.

Mr Potato level guide

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Complete the first gap attempt to trigger a balloon, then use the second attempt to cross and reach the right door.

Layout: A left low platform and a right high platform are separated by a deep gap. The arched door sits on the right high platform.
Goal: Cross the gap on the second attempt after the balloon appears and enter the right-side door.
Opening: Jump right from the left platform into the gap. The first attempt is designed to fall short.
Danger Zone: No intermediate landing exists between the two platforms. The first jump cannot reach the right side directly.
Mechanics: The first fall triggers a balloon to appear in the gap. After the character returns to the left, the second attempt uses the balloon for assistance to cross the full distance.

The first gap fall is part of the intended route, not a failure.
Wait for the character to return to the left platform and the balloon to appear before attempting again.
On the second jump, maintain rightward momentum to reach the right platform with balloon assistance.

Jump right from the left platform and fall into the gap on the first attempt.
Wait for the character to return to the left platform. Confirm a balloon appears in the gap.
Jump right again from the left platform, maintaining rightward momentum.
Let the balloon assist the crossing during the second attempt.
Land on the right high platform and walk right into the door.
Confirm the VICTORY screen.

Trying to reach the right platform on the first jump — the gap is too wide without the balloon trigger.
Not waiting for the character to return before attempting the second jump.
Pulling left during the second jump, missing the balloon-assisted crossing line.

Is falling into the gap a failure in Level 10?
No. The first fall is a trigger step. Wait for the character to return and the balloon to appear, then attempt the second crossing.
When does the balloon appear?
After the first jump and fall, a single balloon appears in the gap. It enables the second crossing attempt.