Yet Another Zombie Survivors Bio Lab Unlock

Official unlock gate

The official 1.0 coverage says the Bio Lab becomes available after Dead Terminal on Default. The announcement presents it as a new progression feature, not as a generic menu available from the first screen.

How to use this information

• If Bio Lab is not visible, confirm that you have reached the named Dead Terminal milestone on the Default setting.
• Keep the exact mode and milestone in your notes; “I finished a run” is not the same evidence as the official gate.
• Recheck the in-game text after updates before treating a community route as current.

The official announcement does not provide a complete upgrade table in the source used here, so this page does not fill in costs or effects from guesswork.