If you happen to have:
-a gameboy advanced/sp
-GC-GB connector cable
-Action Replay Max for the GC
-Wind Waker
you can have a LOT of fun with Tinkle (<~~ wrong name?)'s bombs. Only really fun with two people, though. You need to activate the infinite money cheat. All this will also work on Wii.
Personally, I loved both of these, but got stuck at the last boss, full shadow mode, in TTYD. Again, both are great. Get them. They shouldn't cost THAT much...