QUOTED FROM PLAILECT: "This has been released following Legends of Exidia getting pulled earlier today. This works because one can paste over any DSiWare title's `.app` on the source system with a different DSiWare title's `.app` to replace it. It will launch just fine as long as the file size of the `.app` does not change. The way FBI pastes over existing files performs in exactly the manner we want, overwriting the beginning of the file with our replacement data but not removing the old file, keeping the file size if the replacement is smaller. Note that the savedata bin inside the `public.sav` file must be replaced, but not the entire `public.sav`file. For now this requires a PC. In this case, it allows us to replace nearly any DSiWare title with SUDOKU v0 and sudokuhax." It seems that the best titles for this are SUDOKU and Rytik Rock Edition, as they're both exploitable and only $1.99. They CANNOT be pirated and must still be bought from the eShop!