Reference article
Hot Air Balloon
Steer a hot-air balloon through the desert’s aerial obstacle course to collect Crystal Key C.
Guide
Use the vertical movement control to rise or descend. Wind pushes the balloon sideways, so adjust your height to catch a useful current. Give spike balls plenty of clearance: a puncture ends the attempt.
Reward
Reach the key without popping the balloon. Along with the other two 
Crystal Keys, it opens the tournament gate.