RULES
1) Balls spawn randomly and move in random directions. Collision between different coloured balls results in both balls being destroyed.
2) Every time a ball bounces on the edge, there's a chance for another ball of the same colour to spawn inside the circle. This spawn chance varies depending on how many balls of the same colour are already in play. More balls = less chance
3) Colour loses once all balls of that colour have been destroyed.
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