The term refers to versions of this Flash-based game hosted on third-party websites (e.g., GitHub repositories, unblocked game portals like Cool Math Games derivatives or Hooda Math ). These sites bypass network firewalls commonly deployed in schools and workplaces that block domains categorized as "Gaming."
| Feature | Wrath of the Lamb (Flash, unblocked) | Rebirth (Official) | | :--- | :--- | :--- | | | Adobe Flash (deprecated) | Custom C++ | | Performance | Frame drops with many items | 60 FPS stable | | Content | 100+ items, 10 chapters | 500+ items, 20+ chapters | | Multiplayer | None | Local co-op / Online (Repentance) | | Access | Free (unofficial) | Paid ($15-$50) | | Save system | Manual password codes | Automatic cloud saves | the binding of isaac: wrath of the lamb unblocked