[xeromal]

I remember that there were 2 games that you could use to modify your xbox but I only remember 1 game. Mechassault.

[echelon_musk]

Mechassault, 007 Agent Under Fire and Splinter Cell.

More recently there are other game exploits, such as THPS4. However, since ENDGAME you don't even need a game to softmod.

[KyleJune]

I think I used splinter cell. The exploit was also only in a specific version of the game. I remember having to look at a version number on the cd when buying to confirm I was getting the right one.