Adding something new to an established game is different from designing from scratch. Players already understand the rules, rhythms, and expectations that make the experience work.

When Devhouse worked on Aliens: Fireteam Elite, our goal was to design, build, and launch a new horde map that integrated cleanly with the game's existing systems. The opportunity was not to reinvent the mode. It was to find new possibilities inside something players already understood.

Understand What Already Works

Horde gameplay already gives players a familiar structure. Teams manage space, defend against waves of enemies, support one another, and learn which positions give them the best chance to survive.

Any new environment had to respect those expectations. Movement still needed to feel readable, combat spaces needed to support existing gameplay systems, and players needed to quickly understand how to use the map under pressure.

Understanding that foundation gave us room to push in a new direction without changing the identity of the mode.

Introduce a New Dimension

One of the biggest additions was verticality. We designed a horde map with multiple floors, introducing elevation into an experience where players could otherwise be encouraged to settle into a strong defensive position.

That changes more than the shape of the environment. Sightlines shift, enemy approaches become more varied, teammates move between elevations, and players need to understand a more complicated combat space while staying focused on the encounter.

The idea only worked if that additional complexity remained readable.

Encourage Movement Through the Environment

We also designed a circular flow that encouraged players to rotate through the map rather than treating a single location as the only answer.

The goal was not to force movement for its own sake. Players should move because the encounter makes movement useful. That keeps the new behavior connected to systems they already understand instead of making the environment feel like it is fighting the game.

Lighting became part of that solution as well. We used it to guide attention, reinforce landmarks, and help players build a mental model of the space while moving through combat.

Expand the Experience, Not the Rulebook

Co-development often means building within systems, technical requirements, art direction, and design decisions that already exist. Those constraints are not something to ignore. They are the foundation for deciding where a new idea can create value.

For Aliens: Fireteam Elite, verticality, circular flow, and intentional lighting created a different tactical experience without requiring the core game to become something else.

The strongest additions do not replace what players already enjoy. They give those existing systems new ways to shine.