Tales of Phantasia (Game Boy Advance)

The GBA Tales of Phantasia (the first Tales game) was the only version that was released outside Japan...which is quite a shame, as it is inferior to the PS1 version. Fortunately, we have the Summon Night games, from a different company but a similar premise.

Debug Room
In the Japanese version, by using some cheat codes you can select a hidden invisible option at the title screen that leads you to the debug room.

In the other versions, though, that option was completely removed from the code along with the option and the whole coding for the Sound Test, although there are translated strings of all Sound Test entries and debug options:

NORMAL MAP 1 : FIELD MAP 2 : BATTLE 3 : ARCHE 4 : *TEST PAD 5 : *TEST NORMAL MAP 6 : *TEST BATTLE 7 : *TEST SOUND <bh:00><bh:00>*** debug mode

The debug room is similar to the one used in previous versions.

Regional Differences
As mentioned above, coding for the Sound Test and debug menu were for some reason removed from US/EU versions.

The Japanese opening, "The Dream Will Never Die" (a state-of-art aspect of the Super Famicom original), was replaced by a mix of background music tracks used during the game. The US/EU versions also got the infamous English voice acting.

In the European version, which was multi-language, whenever any language other than English is selected the English dubbed battle cries during battles would get subtitles in little white characters on the top of the screen for each language. It'd be a nice touch, if it weren't for the drastic FPS drops.