Okay in my third game I did a challenge I made up which is just to learn and use the level 2 deathblows. TX TTX and SX through out the game. After I learned those I just kept running from my battles so that I couldn't learn anymore DB's. The game became really hard especially after (Spoiler) Elly leaves(Spoiler). Gear battles also became much harder and dune man's isle became near impossible. Xenogears has such a hospitable environment, so why not make it more of a challenge? Try it if you want a challenge. I did this and I beat the game at around lvl 35-40. Or You could try the all Maria Chu chu Challenge. This is the worst thing I cam up with and I didn't even finish it. Basically all your characters are dead on the second disc and you play as Maria and Chu Chu only (impossible with G Elements can do for Ramsus and Miang in merkava). For the Maria one to work I had to get most of the treasure from the battle arena (mainly GNSR50). That would have to be my hardest one I tried in game 2. If anyone has done anyother challenges for Xenogears please post.