Halo: Spartan Assault launches April 4 on PC through Steam, marking the acclaimed franchise's debut on Valve's virtual marketplace, but don't expect more Halo games to follow.

"We have no further 'Halo' releases on Steam planned at this time," a Microsoft spokesperson told GameSpot.

Microsoft ported Halo: Combat Evolved and Halo 2 to the PC, but all subsequent entries in the series have arrived only for consoles.

A new Halo game will launch in 2014, but it's unclear if this is 343 Industries' "legitimate" Halo title for Xbox One or potentially the rumored Halo 2 Anniversary, or maybe even something else.