Gridmania for the Commodore VIC-20 / Commodore VC-20
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Game description:
Gridmania is an Amidar-like clone.
There are eight different kinds of alien attackers and they start off fairly slowly at level 1 and get faster with each level. Each level has two phases. Phase one has six of the aliens after you and phase two has eight of them. After that it goes back to six, but the level goes up one and a new kind of alien appears.
Your task is to completely cover the white grid with black and then return to home base in the quickest time. If you return to base before completing the grid you will lose a life. You cannot destroy the pursuing aliens so you must avoid them.
If that wasn't enough against you there is also a continually decreasing energy supply at the bottom of the screen. If this falls empty you lose a life. However when you complete a grid and return to base you will get a bonus for remaining energy. You will have to be quick though since this is the only way you can score.
The lowest high-score the game will register is 1500 and you will also gain a free life at this score.