Here is the general process to get Mortal Kombat Trilogy running on your Android device: 1. Download a PS1 Emulator
This is the preferred method for most retro gamers. It involves two parts: an emulator app (which mimics the old console) and a ROM file (which is the digital copy of the game itself). A popular setup is the ePSXe or FPse emulator for the PlayStation version, which many consider the definitive edition.