1) For safety reasons and for the new game to work properly you first have to delete all the existing Subway Surfer version on your device.
2) Download the Tour’s APK that you want from the links given below. If you download the files straight on your Android phone then its okay, but if you are downloading it on your computer then you will have to transfer the downloaded APK file on your Android phone’s storage.
3) Open the downloaded APK file and install it. And you are Done! now you should have Subway Surfers with unlimited coins and keys. I know you must be very happy right now, but I have one more thing that will make you really happy. If you want your previous stats back you can do so by logging in to your Facebook account (you can only restore the stats if you synced the game with your Facebook account).
NOTE: The links given below are not hack, keygen or patch files they are full/complete games but they have been modified so you can get unlimited coins and keys.
Links to APKs:
APKs by TechBeast.com