Microsoft and 343 Industries revealed the latest upcoming title in the Halo franchise, and it’s not Halo 5. In a surprising move, Halo: Spartan Assault will be a top-down shooter available exclusively on Windows 8 devices. It is the first Halo game to be available on touch-screen devices.

Set between Halo 3 and Halo 4, Halo: Spartan Assault allows players to play as either Commander Sarah Palmer–of Halo 4 Spartan Ops fame–or Spartan Davis while investigating the beginnings of the Spartan Ops program. The game boasts 25 single-player missions, and while there is no multiplayer, players can compete with one another on leaderboards and through weekly challenges.

As should be expected, Halo: Spartan Assault will have a number of achievements, but players will also be able to earn XP, achievements, and emblems for Halo 4.

No exact release date has been announced, but Halo: Spartan Assault will be available sometime next month.