Stop repeating the same attempt; test input, camera, approach, and Speed one variable at a time
The official description warns that one wrong move sends you back to the start. It does not publish checkpoint behavior or Speed requirements for individual keys, so a repeated failure should be treated as a troubleshooting problem rather than proof that one hidden number is missing.
First make sure the backflip action fires consistently on your device. Then line up the camera so the keyboard obstacle and landing area are visible. Use a repeatable approach, attempt the flip once, and note whether the failure happens before takeoff, during rotation, or at landing. Changing every input at once makes it harder to identify the problem.
If execution looks consistent but distance still feels short, observe your current Speed and build more through backflips. The Speed Lab can project a target from the multiplier visible in your own session, but it deliberately does not promise that a total clears a particular jump.