The Hyper Rubber Boulder can only spawn in The Pits. Once destroyed, it drops 32 Hyper Rubber. It has the same size as large boulders. Like flux tiles, more spawn with more players, and being made of hyper rubber it is very bouncy.
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Hyper Rubber Boulder spawn more depending on the total player count?
Hyper Rubber Boulder has the properties of Hyper Rubber meaning it's very bouncy.