X Construction - in the game to build a bridge and then test it for strength by a passing train on it.
Apparatus - Create complex machines and do the job! Connecting the battery to the motor, make a bridge, build traffic and move the ball. Creative construction, interesting design. To show their knowledge of physics!
Dillo Hills - The goal is to create momentum to roll down the hill, and then use this rate to float in the air, picking up bonuses and avoiding obstacles. You have a limited amount of energy that is exhausted automatically with the passage of time, and if you have landed on the ground under a bad angle, you lose a big chunk of that energy, so your task is to keep the balance. And the main task is to go as far as possible, new levels become more complex and gradually become very addictive.