Sigma 7

He first have to solve three levels with different gameplay mechanics:

The first is a diagonally scrolling shooter which plays very basic: don't getting hit by the mines which come in formations of three.

It is best to shoot them, however, because surviving mines may come back from the side, which is deadly.

After reaching the station, the game becomes a Pac-Man variant.

In a maze-like field the player needs to pick up glowing balls on the floor without being touched by the enemies.

But there are two important differences: the player controls a tank, i.e. he can shoot the foes, and he doesn't have to pick up all balls.

If he got enough, he can simply use the exit.

However, a few balls can't be picked up and the pattern needs to be remembered,

During the last mini game the player gets presented with a panel of buttons.

He bounces a ball on those buttons to recreate the pattern from before.

He needs to look after a force field which follows the ball's movements - touching it results in losing a life.

The buttons also flash in different colours and the bouncing only gets registered when the right colour is active.

After finishing this level the game loops with faster enemies.

Sigma 7 for Commodore 64 is currently worth €10.74 loose, €12.61 complete in box, and €21.91 factory sealed. Prices are based on real sales and update regularly on Gamevaro.

Sigma 7 has a steady sales history on the tracked marketplaces, meaning it trades hands regularly and isn't considered particularly rare.

Loose means cartridge or disc only, CIB (complete in box) includes the original box and manual, and sealed means factory-sealed and never opened. For Sigma 7, loose is €10.74 and CIB is €12.61 — CIB commands a premium because original boxes and manuals are fragile and often don't survive.