The Callisto Protocol

The game is singleplayer only and features no direct microtransactions. It does contain several pieces of DLC. One of these is larger, providing new additions to the story. This DLC is required to "complete" the game, as the main game ends on cliffhanger. The other DLC are smaller, either providing cosmetic content, or smaller additional gamemodes.

The season pass was initially only available as part of the Digital Deluxe edition, but by now it can be purchased separately. The Digital Deluxe edition also features some unique character and weapon skins. There is no way to buy these skins separately.