Paul Woakes‘ classic first-person shooter on the Commodore 64, Encounter, wowed gamers back in 1983 when it was first released.
You’re basically in a tank, chasing flying saucers and suchlike across and alien landscape and blasting them for points. In-between levels you must fly through a dark tunnel, avoiding oncoming spheres, to make it to the next world, and trickier enemies.
Encounter originally came out on both the Commodore 64 and Atari 8-bit home computers simultaneously, through Novagen Software, and was later ported to both the Amiga and Atari ST. It was published in North America by Synapse Software.
This original Commodore 64 version is still an extremely playable high score-builder and is well worth a play nowadays.
Encounter is simple, timeless blasting action, and also the spiritual predecessor to Backlash.
More: Encounter on Wikipedia