How do I unlock Boss Rush?
Boss Rush is a per-map unlock: finish Hardcore on the arena where you want the mode.
Quick Answer
Complete Hardcore mode on the same map. The official 1.0 changelog says Boss Rush unlocks after Hardcore for each map, so one Hardcore clear does not unlock Boss Rush everywhere.
Steps
- Select the map where Boss Rush is locked.
- Choose Hardcore mode and complete that run.
- Return to the same map's mode selector and choose Boss Rush.
Requirements / Limits
- The unlock is stored per map.
- Bio Lab must itself be unlocked before its Hardcore and Boss Rush entries can be completed.
Common Mistakes
- Clearing Hardcore on Isolated City and checking Boss Rush on another arena.
- Confusing Boss Rush with Infinite; their prerequisites are different.
- Using pre-1.0 posts from the earlier Boss Rush implementation as the current rule.
Sources Checked
- Developer changelog · accessed 22 August 2026Full Release — Version 1.0
Developer changelog, 20 August 2026. Gives the Ranger, Bio Lab, Boss Rush, mission, map and Infinite unlock details used here.
- Developer guide · accessed 22 August 2026Official Troubleshooting Guide
Developer-authored guide. Documents manual aim, map/mode unlock logic and the three-tier weapon path.
- Developer changelog · accessed 22 August 2026Yet Another Update 1.0.0b (Hotfix)
Developer hotfix, 21 August 2026. Latest public patch checked; it changes fixes and mission handling, not the unlock rules on these pages.