Tales of Phantasia (PlayStation)

The PS1 Tales of Phantasia (the A-RPG that started the Tales and Star Ocean series) was a port of the Super Famicom technological-wonder original and easily the best version of it. Unfortunately, the only version that other countries got was the inferior GBA port, due to the anti-2D policy at Sony.

Debug Room
A debug room with various interesting options is still in the game. It can be accessed on the original JP version with the use of the following cheat code:

D007F378 0001 80087AD0 0005

Hold L2 while entering another map to enter the debug room, whose ID is. You can level-up your characters and warp to various locations, including a completely-removed area...