Route and failure check
Plan the boss around stone timing and survival instead of trying it during a chaotic run.
Achievements
Everything is Crab Bullseye Achievement Guide
Kill a regular boss with a stone.
Bullseye achievement quick answer
Bullseye is a regular-boss stone kill. Keep the fight slow enough to preserve the throw window.
Use a dedicated stone route so survival and timing are already solved before the boss is low.
Recommended pages: Stone Bullseye.
Recommended builds
Evidence and verification
The links below support specific dated claims, mechanics, or player-route observations on this page; after a patch, use the current in-game text for exact values.