patch · March 4, 2026

Ultrakill Patch 17b2 Fixes Piercer Splitcoins and Level Softlocks

Ultrakill's latest patch addresses persistent bugs, including Piercer splitcoin target issues, Mirror Reaper sawblade resistance, and multiple level softlocks in 8-3.

Ultrakill patch v17 brings a round of targeted bug fixes aimed at cleaning up weapon mechanics, enemy behavior, and level progression exploits. The update rectifies specific interactions in Layer 8 while adjusting how coins handle their targets.

Weapon and Enemy Adjustments

The default Piercer splitcoin no longer ignores the exact same target on subsequent splits. Mirror Reaper now properly possesses damage resistance against sawblades. Additionally, toxic projectiles fired by Mirror Reaper stop tracking players after a duration of 2 seconds.

Level Fixes and Softlock Removals

Several progression stoppers in level 8-3 have been addressed. The patch removes most out-of-bounds preventers from the final section of 8-3 and resolves an issue where the elevator to the secret could softlock the player if a call button was used on the second floor. Developers also implemented a fix for the Dimensional Cave getting stuck on the wrong side when players cleared out the cave and flesh sides simultaneously as the portal reaches its destination. Lastly, two missing textures on pillars in level 7-3 have been fixed.

Why this patch matters

Patch 17b2 is a clean maintenance update that eliminates frustrating progression bugs and fine-tunes specific enemy interactions without shifting the core combat meta.