Rail Rush by the name itself gives a pretty good picture about the game. The only difference here is it’s a cart running on rail tracks passing through various worlds.
Developed by Miniclip.com, The game initially began with just one world where you pass through an old mine. But later with new updates there were various new worlds like the horror land or steam factory or with the recent update the “Undersea World”. All these worlds are free to enter apart from the “Jurassic Jungle” and the “Pharaoh’s Tomb”. You can visit these worlds against 3 passes but if you want to continue playing you need to purchase them.