Skramble
arcade shoot'em up game for Commodore 64, 1983

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Use Control Port 2.
You fly your spaceship through a cave system split in six sections. Pressing
the joystick button will unleash both your front mounted gun and your bombs.
Missiles will launch in your path in order to intercept you, and you must not
only shoot those down, but also bomb all fuel cisterns you see, or you will
run out of fuel.
The second cave section introduces aliens that fly up and down in your path.
In the third section, you are met by fire balls which are immune to your
bullets.
The fourth section is played out in a very cramped space, where you have
little time to react to the missile launches. Here, the graphical style
changes into a more technological one than the natural caves earlier on.
The fifth section is equally cramped, but with steep shafts which must be
descended into or ascended from with precision, due to the speed at which you
are moving.
Finally, the sixth section is an infinite loop where you must bomb a single
enemy construction before you run out of fuel.
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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)