Plain physics is the main thing in Tractor Trial 2. i found a simple description for it.
Step to move the tractor, use arrow keys or WASD to steer and handle it.
Controls are arrow keys or WASD to steer and handle the tractor. Gas and brake are easy.
Most physics messes with you in annoying ways. Timing your moves is key to avoid the wonky physics.
Q: What are the controls? A: Arrow keys or WASD to steer and handle the tractor.
Q: What is the objective? A: Moving your tractor is the goal.
Q: Are there any stated features? A: Not stated.
Q: What is the main mechanic? A: Physics messes with you in annoying ways.