: Available for purchase on Steam and itch.io . A free demo version is often available on itch.io for those wishing to try before buying. 3. Blue Protocol: Star Resonance The Callisto Protocol™ on Steam
: Players must interact with a strict Artificial Intelligence in an Arctic research facility. Failure to follow the "Protocol" (instructions) often leads to immediate, absurd consequences. protocol-pc-game-free-download-full-version
: Requires a 64-bit OS (Windows 10/11), 8GB RAM, and a GTX 1060 or AMD Radeon RX 580. 2. Protocol (by Fair Games Studio) : Available for purchase on Steam and itch
: This title was notably offered for free on the Epic Games Store in August 2024 and again in late 2025 as part of their holiday giveaways. protocol-pc-game-free-download-full-version