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Prototype
Differences
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The left difficulty switch changes
between the space screen and the trench screen.
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There are
no Tie Fighters.
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There are two fireballs that drop down
the left side of the screen instead of coming at you
from the background.
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| The fireballs cannot be shot or
avoided. |
| The fireballs are green instead
of red or blue. |
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Your shields slowly count down from
eight to zero, and then get reset back to eight.
|
| You can shoot, but
you can't actually hit anything since there is no
collision detection. |
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Up and down actually move the
crosshairs up and down. This is the reverse of the
final version which corresponds to real flight controls
(up is down and down is up).
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| The stars are light green and
are much blockier than the final version |
| The stars fall straight down
from top to bottom instead of coming from the middle and
going to the left and right. |
| The
counters for tower points and number of towers left is
always displayed on the screen even thought he tower
screen is not present in this version. |
| The tower screen is missing. |
| The walls of the trench are
green instead of blue. |
| There are no barriers in the
trench. |
| Neither the space screen or
trench screen have an end. |
| There is no copyright message |
| The game starts automatically. |
| The score counter doesn't work. |
| There are
no sounds or music. |
| The design of the cannons is different. |
