This must be about the best arcade-style game I have seen on the CBM 64. It seems to be based on an arcade game which involves shooting line drawn tanks.
Encounter is a full colour game in which you must locate and destroy flying saucers. The display is a 3D picture with radar and scanners below. Cylinders on the battlefield deflect shots from both yourself and the enemy craft. Sometimes missiles home in on you. If you don't destroy them immediately they smash into your shields.
Once you have killed all your enemies on one level you may go through a gate to the next one. You are propelled through a hailstorm. If you are hit by one of the spheres you are returned to the last level. If you get through, you are awarded an extra shield and sent on to the next level.
The sound is excellent and really makes the game interesting.
Graphics are quite outstandiing. The 3D display is fast, smooth and flicker-free in its movement. The explosions are spectacular as debris flies all over before twinkling away.