Hi! I tried to use Gecko/Ocarina codes for Monster Hunter Tri, but something's wrong. All the codes are working except for 1. That code is the Inf hp (the main one I wanted). I went to see if it worked but I still took Damage! The code the list came with was 4 lines, but I found another one online which was 3 lines. I tried that one too but that doesn't work either! I have looked around but no one else seems to have this issue. Please help!
P.S. By the way I have the US version of the game and yes, the codes were meant for the US version (I'm not THAT stupid).