Stunt GP

Forkster:
Successfully complete championship mode and get ranked first in points. Then, finish track 21 in second place.

Formula 17:
Finish time trial with a time better than the best lap ghost.

Stunt Car:
Complete all routes in arcade mode.

Worms:
Successfully complete mobile championship mode and get ranked first in points. Then, finish track 21 in first place.

Glitch: Fly across the track:
Select to any track and drive at a high speed (about 200 to 270 mph). Ram the car at any wall with arrows. If done correctly, you car should fly off the tracks and into the air. You will end up back on the track if you go too far. Note: This might require a few attempts.
K. Jones.