The PC version of Assassin's Creed III and the soon-to-be-released Far Cry 3 are unavailable on the UK Steam store, according to a report from PCGamesN.
"We've been in discussions with Valve about Assassin’s Creed III and Far Cry 3, but for the time being the games are not available via Steam in the UK," a Ubisoft spokesperson told the site.
The spokesperson did not give a reason or an estimated time until the issue would be fixed.
Ubisoft instructed those in the UK wishing to purchase the games to do so via its Uplay store or from physical retailers in the region.
The issue only affects gamers in the UK, as both games will still be available on Steam in other regions.
Ubisoft recently revealed that Far Cry 3 will not support dedicated servers. The game will cast players as Jason Brody, a man stranded on a strange tropical island similar to the setting of the first Far Cry.
For more on Far Cry 3, check out GameSpot's previous coverage.