Operation Yellow [Chapter ]

Operation Yellow [Chapter 2] is a psychological horror escape game on Roblox developed by CHD Development Studio, set in an underground laboratory where a weaponized hallucinogenic gas called Yellow drove experimental subjects insane. Since launching in June 2025 it has accumulated 13.3 million visits, 300K favorites, and a 90.9% approval rating.

Players cooperate to complete three facility objectives while Yellow gas seeps through vents and walls, distorting perception the deeper they descend into the lab:

• 🗺️ Three objectives: override blast doors, purge data centers, and burn evidence of Experiments Y-35 and Y-36
• 🗺️ Hallucination effects worsen with depth - the deeper you go, the less you can trust your eyes
• ⚔️ Up to 14 players cooperate while avoiding mutated creatures and gas exposure
• 💎 INSANITY mode offers a harder run with elevated threat levels and gas intensity
• 🎭 Multiple outcome badges reflect how players escape - or fail to
• ⏳ Chapter 3 hinted at following Chapter 2's release

Gamepasses like Thermal Vision (399 R$) provide practical advantages - seeing through gas and darkness where the standard view completely breaks down.

This is the second chapter in the Operation Yellow series, significantly expanding the facility's lore and difficulty for players who completed the original.