A thing doesn't noticed in the game: Snap tower level 2 and above can stun the enemies, the higher level of snap tower, the longer stun duration. This is essential to deal with later waves ( the 100 mode) of flying creeps which have extremely high health.
Tip for lv 9: Make blue on the ceiling, and make yellow right below the blue. Jump into yellow, you will infinitely dropping. In the midair make blue beside yellow, then you'll be able to jump on the high platform.
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