Main Facts
The tactical military shooter landscape has a formidable new contender. Hell Let Loose: Vietnam, developed by Expression Games, arrives as the highly anticipated follow-up to the studio’s critically acclaimed 2021 hardcore World War II multiplayer first-person shooter. Transitioning from the European and Pacific theaters of the mid-20th century to the dense, unforgiving landscapes of Southeast Asia during the Vietnam War, the title sets a new benchmark for tactical, large-scale, squad-based multiplayer combat.
Powered by Epic Games’ Unreal Engine 5, the game delivers breathtaking 50v50 player battles across sprawling digital recreations of the region’s complex ecosystems. Spanning roughly 24 square kilometers of playable landscape spread across six distinct maps at launch, Hell Let Loose: Vietnam immerses players in a gritty simulation of asymmetrical warfare. Featuring towering canopies, winding river systems, hidden tunnel networks, and muddy rice fields, the title challenges both virtual soldiers and the developers who brought them to life.
To uncover the monumental technical and artistic undertakings behind this massive production, Creative Bloq’s Ian Dean sat down with Expression Games’ Senior Art Director, Ryan Playle-Howard. The resulting deep dive illuminates the delicate balancing act between historical accuracy, cutting-edge engine capabilities, and the realities of modern remote game development.
Chronology: From Concept to Combat
The journey of bringing Hell Let Loose: Vietnam from a conceptual pitch to a fully realized live-service multiplayer ecosystem required a meticulously phased development timeline.
- Pre-Production and Research Phase: Early development centered heavily on location scouting, archival research, and asset exploration. Rather than rushing into building environments, the team spent months analyzing historical documentation, combat diaries, first-person infantry accounts, and declassified military photography. By cross-referencing real-world topographical data via Google Earth and Digital Elevation Model (DEM) datasets, Expression Games mapped out authentic historical theaters of engagement.
- The Vertical Slice Milestone: Establishing an early vertical slice was critical for the studio. This controlled production phase allowed the art and design teams to stress-test their initial ideas, prove out core workflows, and define the definitive visual quality benchmarks that would govern the rest of the project.
- Engine Transition and Tool Development: Moving from Unreal Engine 4 (used in the original Hell Let Loose) to Unreal Engine 5 presented a monumental paradigm shift. The team had to build, mature, and expand specialized procedural toolsets—most notably Epic’s Procedural Content Generation (PCG) framework—to populate vast jungle biomes without sacrificing artistic oversight.
- Software Migration: Amidst engine upgrades, the art department executed a risky yet successful transition from Autodesk Maya to Blender, requiring extensive retraining and workflow adjustments across the entire staff.
- Launch and Live-Service Expansion: Hell Let Loose: Vietnam officially launched to the public via Steam and modern console platforms, accompanied by a robust roadmap for future content updates, new biomes, and ongoing iterative tool optimization.
Supporting Data & Technical Breakdown
Replicating the claustrophobic yet expansive nature of the Vietnam War required innovative technological solutions. Building sprawling environments by hand is economically and logistically unviable for a mid-sized studio, prompting Expression Games to lean heavily into advanced software pipelines.
Scaling the Jungle with PCG Tools
With approximately 24 square kilometers of playable map space distributed across six launch maps, manual foliage placement was impossible. The team utilized Unreal Engine 5’s PCG framework to construct dense, transitional jungle biomes that bridge the gap between art-directed points of interest (POIs).
However, automation came with risks. "At that scale, we couldn’t approach the jungle purely by hand," Playle-Howard explained. "We needed to build a toolset that allowed us to create that density and complexity quickly, but crucially, it still needed to be art and design-led." By utilizing Runtime Virtual Texture (RVT) spline pathways and strict exclusion zones, artists were able to carve natural trails through procedural foliage, blending automated generation with handcrafted tactical spaces.
Optimizing Asset Variation with Custom Primitive Data
Natural environments quickly expose repetition if asset libraries are sparse. To combat this without crippling performance across multiple hardware platforms, Expression Games adopted Custom Primitive Data (CPD). This technology allowed the team to introduce radical variations through materials alone—altering color tones, wear, and texture nuances—without generating massive numbers of unique asset files or heavy material instances.
Shifting Pipeline Infrastructure
The studio’s rapid growth coincided with a transition from Unreal Engine 4 to Unreal Engine 5. This enabled high-end PC features like Lumen for dynamic global illumination alongside complex mesh-and-material hierarchies. Simultaneously, the complete adoption of Blender as a primary 3D modeling package required the studio to formalize its documentation, making workflows more repeatable and standardized for a distributed workforce.
Official Responses: Inside the Mind of the Art Director
Speaking candidly about the development process, Senior Art Director Ryan Playle-Howard provided vital context regarding the artistic philosophy driving the game:
-
On the Greatest Visual Challenge:
"Unquestionably, the biggest challenge was achieving the fidelity, density and variety needed to convincingly represent our version of the Vietnamese jungle… Ultimately, the challenge wasn’t just making a jungle that looked convincing in a screenshot. It was making one that remained convincing across kilometres of playable space."
-
On Escaping Hollywood Clichés:
"You can’t ignore the amount of pop-culture reference that exists around Vietnam. It’s part of the modern lexicon… But it’s very easy to lose sight of reality and become influenced by someone else’s interpretation… Quite often that meant going back to the historical imagery and details rather than leaning too heavily into pop-culture references."
-
On the Philosophy of Map Design:
"The location needs to bring something new to the title. The visuals, feel, and playspace are always important considerations, but ultimately ‘gameplay is king.’ The art MUST support good gameplay… Offering a range of scale is hugely important. We require large open areas that support vehicle gameplay… contrasted with areas of cover and tighter spaces that create opportunities for close-quarters infantry gameplay."
-
On Managing a Remote Studio Culture:
"As a remote studio, the key for us is finding ways to emulate that [office] collaboration as much as possible… Whether that might be Discord streaming, open Google Meet sessions, regular show-and-tells, or things we trial within each discipline. Ultimately, collaboration makes better games and better art."
Implications for the Industry and Franchise
The successful launch of Hell Let Loose: Vietnam signals several important trends for the tactical shooter genre and game development at large:
- The Maturation of UE5 Tools in Live Service: Expression Games’ heavy reliance on Unreal Engine 5’s PCG and Lumen systems demonstrates that procedurally assisted world-building is no longer restricted to open-world survival games; it is becoming vital for competitive, performance-heavy tactical shooters that demand massive scale without sacrificing tactical fidelity.
- Redefining Historical Authenticity: By deliberately eschewing iconic cinematic tropes in favor of primary-source archival research, Expression Games has set a higher bar for historical representation in video games. This approach respects the gravity of real-world conflicts while delivering fresh experiences to players tired of Hollywood-filtered narratives.
- Scalable Pipelines for Remote Studios: As the video game industry continues to grapple with distributed and hybrid work models, Expression’s emphasis on structured documentation, strike-team reviews, and regular internal seminars offers a blueprint for maintaining artistic cohesion and high-fidelity standards across remote teams.
Hell Let Loose: Vietnam is available now on PC via Steam, challenging players to master the art of squad coordination beneath the heavy canopies of Southeast Asia.
