You have to drive injured man to the medical center as fast as you can.
That' ll not be easy and you have to "solve" your path in each level...
UP / DOWN - Hydraulics
RIGHT / LEFT - Drive
Z - Brakes - rear track
X - Brakes - front track
R - Restart Level if you flip or loose track or something...
drive, fast, injured, level, medical, path, Solve, tracked, vehicle