"moon" features first-person shooter gameplay and full 3d environments that the player can explore. over the course of the game, the player can collect a variety of weapons to fight enemies. the game has three difficulty modes and is presented in multiple episodes with checkpoints scattered throughout each one. the upper screen of the ds displays the player's view of the environment, while the lower screen displays menu commands and a real-time map. the game's story will be revealed as the player progresses through each level with pre-rendered cutscenes, text logs accessible through computer terminals, and communications with the player character's superiors. much of the fighting the player experiences takes place in narrow corridors, although the developer has mentioned that the updated game engine allows for wide-open environments and large groups of enemies. the game does not feature any multiplayer mode, with the focus of the game being the single-player campaign.