The free version of DamonPS2 a few obvious differences when compared to the paid version, the most noticeable being that the free version has ads. This is very important, because if you don't get a BIOS, you won't be able to play anything, no matter how many ISOs you have on your device. Like almost all emulators, you'll have to download the BIOS yourself. Not only that, all those games run very well on this emulator. On paper, it can emulate 90% of the PS2 catalog. DamonPS2 is a PlayStation 2 emulator for android with remarkably good performance on a wide variety of android devices, as well as loads of games.