Billion Builders: City Tycoon is a free simulation game developed by 5minlab Corp. for Android devices. The game allows you to build your own city by recruiting workers and growing their skills. With simple idle gameplay, you can see civilization grow right before your eyes.

The game features billions of workers and an unlimited building process. To play, simply tap to stop the train and hire as many workers as you can. Watch your city grow and ennoble the whole space. The more workers you hire, the faster the building process becomes. Try to guess what the construction is and keep going.

Overall, Billion Builders: City Tycoon is an enjoyable game for those who love simulation games. The gameplay is easy to understand, and the graphics are impressive. The game is free to download, making it accessible to everyone.