Is it possible to add the Any% 1 Loop mode for Arcade? pls... thanks. So as to submit my run-attempt.

Agreed. If NES has a 1 loop cat, no reason why the arcade version shouldn't have one.

ah yes the good old half the game%

In my humble non mod opinion, saying this in the most gentle manner, 1 loop categories for this series suuuuuuuuck.

Since few people play the arcade version and the difficulty increase in the second lap is not as great as in the NES version, I don't see much point in going to the trouble of creating a 1 loop category.