There were lots of old video games that I had a lot of fun playing on my original PlayStation console back in the day. Those old games can be enjoyed again on many devices including Android smartphones.
A new emulator has landed on the Android market called PSX4Droid. The maker says the app is for high-end devices, presumably that means you need some muscular hardware to run the emulator.
The app can be purchased for $5.99 right now and you need a PS BIOS file and ROMs to be able to play games. The graphics look about as I remember them on the console.