Replenish Your Gun Clip
Description: Get more bullets for your gun clip without having to spend much money.
How to: Find a character who is trading gun clips, and swap your old, somewhat or completely used one for a new, completely replenished one.

Neverending Fuses Glitch
Description: The barter system will allow you to purchase fuses to complete various puzzles throughout your quest. Without completing them, you can't proceed. But there's a major glitch in the system
How to: Starting with the very 1st fuse puzzle. After completing it, go back to the puzzle and grab all of the fuses. These will stay in your inventory and can be used on future puzzles. You will never have to search for or buy more fuses if you do this!