This probably haven't been asked yet, but it's something that's been bugging me for awhile. I've seen cool mods of NSMB2, SSB4, Mario 3D Land, MK7, and probably more. What I can't find is how these mods were made. Well, I've seen the 3D Land Level Creator, but that's about it. See, there's this game I wanted to tinker around with but I have no clue on how to do it. Is there a specific tool that most users use to break the game and make changes with it?