The linear XP grind loop is the engine — train, fight, level, repeat up to cap 16,000. Replace solo enemy-beating with crew-based milestone gates: shared level thresholds that unlock zones only when a party hits a combined score. Same grind dopamine. Cooperative shape. At 492,568 CCU with a vibe score of 0.16, the audience is already massive and retention-hungry. A crew-gate layer costs nothing structurally but shifts the loop from extractive to additive, pulling the vibe score toward prosocial territory without touching the core combat cadence.
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