A Puyo Puyo Tetris Trainer/Modding Tool
PPT-Sandbox lets you modify all sorts of garbage parameters, add some scripts that do various things, and generally just fool around with the game.
All changes to your PPT client, if used online, will desync and give you a connection error - with the only exception being if your opponent is using the exact same setup (hence, the save/load feature). Some things don't work online, so they've been put into their own category under Scripts / Offline Only. I try to make everything work online but I don't have much to work with and PPT isn't put together very well, the fact that most things work online is a miracle.
Being open source, you are free to compile it yourself and toy around with the newest additions before they are released. However, save files are volatile and won't be compatible will all the new changes, although the program will still attempt load them due to being the same version. I would advise against using saves from previous commits for that reason. You are also free to ask for pull requests, especially for translations.
Big props to mat1jaczyyy, for teaching me some of the basics in WPF and C#.