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During the Heart of the Swarm campaign I've was given the advice: if you lay more creep tumors, your creep will spread quicker.

Is that the case in multiplayer game?

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up vote 7 down vote accepted

This is indeed true in multiplayer as well; placing multiple tumors near each other makes the creep spread faster. I have seen this mentioned and demonstrated in videos, but the only reference I can find right now is via Liquipedia:

Multiple Creep Tumors in the same space also have the compounding effects of spreading creep more quickly.

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Do you also know what means "same space"? TL site is down for maintenance right now, so i can't refer to it. Thank you. – Budda Jun 4 '13 at 6:02
@Budda You might want to check here – Marco Geertsma Jun 4 '13 at 6:29
@Budda What it means is multiple Creep Tumors close to each other. I am not sure how close they need to be, but they don't need to be exactly touching to increase the rate of creep spread. – Steven Jun 5 '13 at 0:34

It's true and rather simple to explain:

Don't consider creep tumors defining the area where creep might spread.

Instead, consider them as generators:

Every x seconds every creep tumor will spawn a new creep tile within its radius, if there's an unoccupied terrain tile left that is next to existing creep. Also for this it will pick closest possible location first.

If there are two (or more) creep turmors nearby, you'll just end up with 2, 3, or more new creep tiles every x seconds, which essentially speeds up the process.

Overall, creep generation (and degradation) is a "game of life" kind of simulation. If there's no tumor or main building nearby, tiles "die". If there is one, they grow.

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This is a good way to think about it, but bear in mind that Creep Tumors ultimately do define where creep spreads: there is a maximum radius (increasable in single player) beyond which a tumor will not spread creep. – Steven Jun 5 '13 at 0:35
Yes, they're just looking for unoccupied terrain within a specific radius. – Mario Jun 5 '13 at 8:46

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