Donkey Kong / GAME HISTORY

Why Does Donkey Kong’s Level 22 Timer Run Out So Quickly?

The bonus timer starts at 400 because a calculation wraps before the game checks its upper limit.

By Patchlo Editorial Desk · Published October 24, 2026 · Sources checked October 24, 2026

Scope: Original arcade Donkey Kong; level 22-1. Emulator-assisted demonstrations are distinguished from ordinary play.

Where do the missing points go?

Jeff’s ROMHACK technical analysis gives the calculation as level × 10 + 40, followed by a cap at 80. Those units are then displayed as hundreds of bonus points. At level 4, the result is 80, giving 8,000 points. Later results are normally capped at the same amount.

At level 22, the addition produces 260. A byte can hold only 0 through 255, so the stored result becomes 4. The cap sees that small result rather than the original 260. It therefore fails to replace it with 80.

What does the player actually experience?

The familiar barrel stage appears, but the bonus runs out before a normal climb can get Mario to the top. The game handles that as running out of time. It does not load a planned ending sequence.

That is a useful difference from Pac-Man’s split screen. Both stories involve a small numeric value wrapping, but Donkey Kong damages the time available to play; Pac-Man damages the board’s display and dot supply.

Was level 22-1 ever passed?

Yes, with an important qualification. In 2025, Kosmic demonstrated an emulator-assisted route past 22-1 using precise inputs and a ladder glitch. Reporting documents a later stop at 22-6. That makes the old claim that 22-1 can never be passed too strong.

The demonstration does not make the timer correct or turn the stage into an ordinary skill check. Keep the categories separate: a normal arcade run, a tool-assisted route, and a ROM patch can reach different results for different reasons.