Guardian Force (Arcade)
This game has regional differences.
While the arcade version was never officially released outside Japan, the Sega Titan Video BIOS allows the selection of various regions, one of them being the US region, which turns the Japanese text into English.
The Japanese version has two endings: a bad ending if you don't beat the last boss in less than 30 seconds, and a good ending if you do. If you change the game to a non-Japanese region, regardless of the method used to defeat the last boss, you will always get the bad ending. This is probably because the bad ending does not contain any Japanese text, but the good ending has a lot of it and they did not bother translating it.