6

There are doors that require many keys to open. Is it possible to get keys as drops or do you have to purchase them?

4

They are dropped. The time between drops seemed random and sometimes too long IMO, but i got keys for every gate except for the ones in the 3rd world (still playing...)

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3

From the official Support page (click on "Stars, Keys and the Gates they Open!"):

If you don't have enough Keys to unlock a gate, you can replay levels to earn more. Keys may appear in any level or mini-game, as they are dropped at random by zombies. Keys also may be among the treasures found in Yeti Zombie Lunchboxes.

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