| The playing field starts as a circular disk centered at the origin. |
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| Bacteria grow on the circumference of the disk starting at an arbitrary spot on the circumference and growing out uniformly in each direction from that spot at a speed determined by the game. |
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| The player needs to eradicate the bacteria by placing the mouse over the bacteria and hitting a button. |
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| The effect of the poison administered is to immediately remove the poisoned bacteria. |
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| The game can randomly generate up to a fixed number (say 10) of different bacteria (each with a different color). |
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| The bacteria appear as a crust on the circumference of the disk. |
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| The game gains points through the delays in the user responding and by any specific bacteria reaching a threshold. |
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| The player wins if all bacteria are poisoned before any two different bacteria reach the threshold mentioned above. |
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