Doom Eternal Mars Core: Mission 7 Walkthrough And Tips

Mars Core represents a pivotal turning point in Doom Eternal’s campaign, delivering both devastating firepower and escalating challenges. While shorter than previous missions, this chapter demands precision execution and strategic resource management to overcome its powerful demonic opposition.

This mission introduces the legendary BFG-9000, but ammunition scarcity transforms it from a crutch into a tactical decision point. Understanding enemy attack patterns and environmental navigation becomes increasingly critical as the difficulty curve steepens.

Following the introductory cinematic, immediately engage the nearby fodder enemies to build resources. Navigate through the left doorway adjacent to the elevator, then ascend the staircase while maintaining situational awareness. Locate the ventilation shaft for alternative routing through the facility’s infrastructure.

Upon entering the dimensional gateway, prepare for confrontation with the Baron of Hell—a formidable adversary sharing combat characteristics with Dread Knights. The Chaingun delivers optimal damage output against these heavy demons, but remain mobile to evade their fiery energy projectiles and ground-slam attacks that can quickly deplete your health reserves.

Pro Tip: Utilize the Super Shotgun’s meathook attachment to create distance while dealing significant damage, then switch to the Chaingun for sustained fire during the Baron’s vulnerability windows.

After clearing the interior sections, progress through successive doorways until reaching the Martian surface. The exterior combat zone introduces mixed enemy compositions including Cacodemons, Arachnotrons, and the particularly dangerous Cyber Mancubus. Leverage weaker demons for health, armor, and ammunition replenishment through glory kills and equipment usage.

The Doom Hunter reappears as a standard combatant rather than a boss encounter. Concentrate rocket barrage attacks on its mobility sled to disable movement capabilities, then focus on the exposed upper body. This tactical approach mirrors the strategy employed during your initial confrontation in earlier missions.

Common Mistake: Many players waste precision weapon ammunition on the Doom Hunter’s armored sections. Remember that explosive weapons and the Ballista prove most effective against its sled components.

Descend through the newly formed opening and execute a precisely timed jump through the rotating fan blades below. In the chamber featuring massive hydraulic pistons, eliminate all hostile entities before utilizing these mechanical structures as ascending platforms to reach elevated positions.

The legendary BFG-9000 now resides in your arsenal—this ultimate weapon decimates nearly any opposition but suffers from extreme ammunition scarcity. Deploy it strategically against the Cacodemon swarm that materializes, observing its area-of-effect capabilities against clustered enemies. Collect the ammunition cache centrally located on the platform before transitioning through the next portal.

Navigate the floating platform sequence until returning indoors. Engage corridor defenders before accessing the next combat zone featuring a Buff Totem—immediately after descent, sprint leftward to locate and destroy this enhancement source to prevent continuous enemy reinforcement.

Advanced Technique: Preserve BFG ammunition for emergency situations or rooms containing multiple heavy demons. A single shot can eliminate an entire encounter when timed correctly during enemy spawn sequences.

After enemy elimination, descend through the newly accessible opening and follow the passageway to an elevator system. Activate the control interface at the summit and proceed through the opened doorway to operate the Ion Catapult. Following wall penetration, address remaining hostiles before progressing to the tentacle-infested chamber.

Execute leftward navigation followed by another left turn to access the ventilation network. From this position, leap across to the opposing launch platform and employ the swing poles to descend into the major excavation site.

Traverse subsequent platforms and descend rightward of the staircase, where scalable rock surfaces become visible. Proceed downward and bound to the compact platform featuring an upward-jump mechanism, then time your ascent to circumvent the rotating debris and access the subsequent zone.

Eliminate the appearing Cacodemons and utilize Dash Refills to reach the next substantial platform. This engagement area contains numerous adversaries including two resilient Barons of Hell. Fortunately, BFG-9000 ammunition awaits by ascending the stairs and turning right—deploy this resource to efficiently clear the combat space.

Optimization Strategy: For players seeking faster completion times, utilize the floating explosive barrels to eliminate groups of enemies during platforming sequences, reducing subsequent combat duration.

Progress through the subsequent doorway, evade laser emplacements, and clear the chamber of remaining threats. Additional platforming challenges await, but the crimson explosive barrels drifting through the atmosphere can be weaponized to eliminate multiple demons, simplifying navigation complexity.

After reaching the large platform and neutralizing the Baron of Hell, activate the jump pad to access the upper level, then leap to the floating platforms with climbable surfaces mounted on their sides. Employ these structures to cross to the substantial platform guarded by an Arachnotron. Eliminate this demon and address the Zombie reinforcements, then jump to the right-side wall and ascend. Defeat remaining enemies, deploying the Chaingun against the Baron of Hell, and follow the navigation marker to the final jump pad.

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