(pulls out list)
Yu-gi-oh Trading Card Game based Tournament
Yu-gi-oh OCG based Tournament
Yu-gi-oh Fatal Four Way tournament *
Yu-gi-oh Last Man Standing
Yu-gi-oh Custom Tournament *
Yu-gi-oh Triple Threat Tournament *
Yu-gi-oh Gauntlet Tournament *
Yu-gi-oh Tag Team Tournament ~ Already been done.
There's some of the ideas I have. :p
From Link: The suggestions with the Green Astrid mark are ones that I have never heard of and would like some explanation as to how they work :p