No reliable, platform-specific documentation is available to describe Under Fire!’s viewpoint, objectives, modes, level structure, player actions, or progression systems.

Gameplay details are therefore left unreported rather than inferred from the title alone.

Prioritize enemies that are about to attack, keep the gun aimed near likely target areas, and avoid wasting shots on harmless scenery. In two-player play, divide attention between different sides of the screen when targets appear simultaneously.