Expedition uses an open source, cross-platform app that is free on iOS, Android, and web browsers. The app comes with a variety of pre-built adventures and also provides tools for you to create and tell your own stories. The game makes use of a unique card-based system for combat. Each player has a deck of eight unique ability cards. Every turn, each player draws three cards, then chooses one to play. This must be done quickly, however, because the app times combat; if your party takes too long, you suffer additional damage! This simulates the hectic nature of battle and balances the time spent role-playing and performing combat.