I am playing this game from last 2-3 years. Earlier that I was use to play Temple Run whenever I get free time. Subway surfer is available for free of cost on Google Play to download and install. The game is pretty much addictive and quite similar to Temple Run.
You wont get bored while playing it. The game is very much optimized for my smartphone which uses Intel chipset along with PowerVR GPU. I didnt noticed lag while playing this game.
The gameplay is similar to Temple Run you have to run and catch up the coins while running through railway subways. You can use your coins for buying other utilities that can help you to stand alive more. The game get faster after you progress that increase your difficulties. Just enjoy but dont get addicted to it.