Operation Heartburn has officially launched in Pressure, bringing a brand-new special expedition set in the Deep Earth Quarry. Released on September 12, 2025, this mission challenges players to step into the boots of a Guardsman sent by Urbanshade to deal with a dangerous outbreak. Here’s a complete breakdown of what to expect in this update.
Overview of Operation Heartburn – What You need to Do?
This expedition takes place after the lockdown and the obtainment of the Crystal. Players are tasked with hunting down and eliminating coworkers who have been taken over by Z-863, turning them into a threat known as Revenants. Your mission is to:
- Eliminate all Revenant groups (Z-863-2).
- Progress through four quadrants, each filled with unique threats.
- Defeat The Heart, the central boss, to complete the expedition.
The expedition is fully set inside the Deep Earth Quarry, a dangerous zone filled with tight spaces and infested enemies. Each quadrant ramps up the difficulty, forcing players to balance survival with completing objectives.
Monsters and Characters – Mechanics
Throughout the Deep Earth Quarry, players will face a variety of hostile monsters, each requiring different strategies.
Hostile Monsters include:
- Revenants – Main infected threat.
- Sprinters – Fast attackers.
- Pariah – Aggressive enemies.
- Scuttler – Mobile threats in groups.
- Abscess – Hazardous enemies with area effects.
- Rook & Bulwark – Defensive types with heavy armor.
- Marksmen – Long-range attackers.
Key Characters:
- HQ – Provides mission directives.
- Guardsman – Your playable role.
- NAVI AI – Guides you through objectives.
Achievements and Rewards
Operation Heartburn introduces several challenges under The Takeover event, each unlocking exclusive rewards designed by reamnos:
- The Takeover: Noob – Clear Quadrant 1 Revenants → Rotten EXR-P Jumpsuit
- The Takeover: Pro – Clear Quadrant 2 Revenants → Rotten Labcoat Jumpsuit
- The Takeover: Master – Clear Quadrant 3 Revenants → Rotten Uniform Jumpsuit
- The Takeover: Experimental – Clear Quadrant 4 Revenants & burn The Heart → BadgeTest Jumpsuit
Operation Heartburn is the third special expedition in Pressure and arguably the darkest one yet. Between the addition of new hostile monsters, the atmospheric Deep Earth Quarry setting, and layered challenges tied to The Takeover achievements, players are in for an intense and rewarding experience. If you’re looking to push your skills and unlock exclusive cosmetic rewards, this update is a must-play.