You are stuck in a tunnel with your car that has a bomb attached to it, your goal is to survive.
The bomb explodes whenever your speed gets below the Death Speed. And every 30 seconds the Death Speed increases by 5kph.
Thought that's enough? Not yet, there are obstacles in your way that will make you loop through the tunnel, but don't lose control of your car or.... you know what would happen..

This is ANTRAVITY, aka Anti Gravity