Some Steam users in the U.K. attempting to redeem codes for Dead Island: Riptide have instead unlocked Dark Souls: Prepare to Die Edition, according to posts on the Steam forums.

A group of players who purchased the codes at retail found they had access to Namco Bandai's game rather than the sequel to Deep Silver's 2011 zombie-slashing action title. Deep Silver community manager Maurice Tan took to the forums to explain the situation, stating the code mix-up affected retail copies of Riptide in the U.K. and Nordic regions.

"To the best of my knowledge this issue would affect retail copies in the United Kingdom and Nordic countries," he wrote.

"We are aware of this mixup by whoever printed these codes for a completely different game from a different publisher, and are working on a best possible solution to help affected players and retailers," Tan added.

In a later update, Tan said Deep Silver is working with Steam to correct the issue and get copies of Dead Island: Riptide into the hands of players who purchased it.

"We've worked with Steam to resolve this issue," he wrote. "If you are getting your retail copy of Dead Island: Riptide today, the code will work properly. If you had redeemed it and received Dark Souls instead, please contact Steam support. They are aware of the issue and will make sure the correct game will be attached to your account."