Zolyx
arcade puzzle game for Commodore 64, 1987

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Use Control Port 1 and 2.
Zolyx is a Qix variant:
the player is presented with a white playing field and controls a pixel.
Whenever this pixel moves over the playfield, it leaves a line behind -
and when the line becomes a closed form, it gets coloured.
The goal is to colour 75% of the playfield; everything above gives bonus points
for the high score list.
Well, it is not that easy. White pixels fly around the field and touching them
result in death; similarly deadly is going backwards on a line. At least the
player has two tricks to help himself: he can change the direction of the
white pixels by pressing a button (limited) and jail them when drawing a
closed line around them. This is possible because the pixels are either
confined to the coloured or uncoloured parts.
After finishing a level a new one starts with three changes: one more white
pixel, an extra life for the player and one additional usage of
the "direction change" button.
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Some useful keyboard shortcuts
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[PAUSE] - stop/continue game
[F9] - quick load game state
[F12] - quick save game state (still stored after leaving the site)
[F11] - toggle fullscreen mode
[ScrollLock] - quick switch control ports
[PageDown] - make a screenshot (320x200)