Steel Underlords combines the original auto-battler and the features developed in the Impact remix.
Choose a country before each match; each multiplayer player chooses independently. The vehicle pool is limited to that country's main-line vehicles, excluding identified premium, event, marketplace, squadron, and shop vehicles.
Three compatible copies combine through 2-star and 3-star units. Two stars double base combat power and HP; three stars triple them.
Tanks and infantry can entrench; SPGs and attack aircraft gain damage from distance moved or target range. Fighter and anti-air targeting is restricted to aircraft.
Terrain changes defense and mobility. Battles use original low-poly miniature models, projectiles, impacts, and reactions.
The match ends for a player at zero health; eliminated players no longer block multiplayer survivors.
The application reads local game data only and does not redistribute War Thunder or Dota Underlords assets. Vehicle pool classification uses identifiers and configuration flags available in the local War Thunder installation.