This game is not free. The Practice track is free, so its free to try, but other tracks are purchased using In-App purchase.
For issues and concerns please send an email to me: burningthumb at gmail dot com
BTS Kart is a fun Karting / racing game for all ages.
This version of the game is a prototype based on Unity samples and custom code. It has been released to gauge interest. You can express interest by making an In-App purchase. If there is sufficient interest I'll add more features and more tracks to the game.