In this game, I tried to tweak the checkpoints so that they are activated only if you have the right power-up. These power-ups, scattered in the level are represented by three colours. There is no need to pass all the checkpoints in one lap as there is plenty of time for doing two or more laps. For any problem or suggestion, you can write a comment. I'll answer asap. Have fun! PS: The assets are taken from http://sketchfab.com/ while the background music from the free music youtube collection.