It technically plays NES and GBA games but not so good. Plays SNES just fine. Can't get it to play Playstation games, even though the box says it can.
I was able to get Playstation games to run. Inside the Game folder, create a directory called PS. I tested Castlevania SOTN which came in a zip folder containing a cue file and two bin files. Create two folders inside PS, one will be a zip folder and the other a normal folder. They need to have the same name. The cue file goes into the normal folder. As for the two bin files, only one needs to be in the normal folder and the other in the zip folder. If it doesn't boot, swap the places of the bin files. I was able to play a game but even though it said I saved the game, the memory card function doesn't seem to work normally. While you can "save" a game, that save data is lost every time you start the game new. But if you use a save state and then save your game, it does load but only after you first load the save state. I doubt an actual memory card file is created which can be problematic for games that require memory card data. I.E. multi-disk games like Final Fantasy 7.
Nes, Snes, Sega MegaDrive works well but gba roms are slow and music is distorted. Console itself is well built high quality material just as the original snes mini.