Just a common Worm AKA Snake game, not really a 3D. More like two and a quoter or and a half D. You can't control the speed, only the direction. Eating fruit gives your points and makes you grow longer. Hitting a wall or yourself makes you die. Happy eating.
Navigate your submarine around obstacles in strong rotating currents to plug the nasty giant holes in the Mediterranean sea bottom. In case you are wondering, it is you, Harry Stamper, on the picture. Don't let it happen to you!
Position your space ship among enemies and detonate mines on your own board to cause maximum damage to the foe. In real life that would be a suicide mission, but not in this game.
A lander with a twist. Instead of manipulating your ship's engines to navigate to a safe landing spot while conserving the fuel, you have to bomb the Martian city to convert it into a nice landing field.
An arcade shooter. Something in the line of Space Patrol with only left and right movements, or Space Invaders with no shields and alien ships coming vertically one by one or in small flocks.