Webby Watermelon
The grab weapon allows the player to hold onto a group of non-boss enemies. There is no limit on how long you can hold an enemy, but other actions such as building and upgrading are disabled until the enemy is released or defeated.
It is possible to drop enemies off the map and kill them instantly!
Hidden Locations
Watermelons are found in any variation of the Autumn maps. The easiest way to get all 7 is to search in Level 3E. Otherwise, it requires using a glitch on the shore to reach all locations.
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Next to spawn.
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Next to base between the tree and windmill.
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Jump on boats to reach shore.
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Jump on bridge to reach area.
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Start from 4 and jump on boat to get around trees.
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Jump on boat from base.
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Start from 6, jump to shore, and go left along shore.