on a restricted computer, keep in mind it is a high-end 3D game that usually requires a powerful PC or console.
Schools and workplaces often use firewalls to block gaming sites to preserve bandwidth and maintain focus. "Unblocked" versions are typically: fnaf security breach unblocked
There is a brilliant fan-made version of Security Breach that runs in a browser. It uses retro 2D pixel graphics (think original Game Boy). While it’s not the full 3D experience, it captures the map, the tension, and the escape sequence. This is what most "unblocked" sites are actually linking to. on a restricted computer, keep in mind it