Those who purchased Call of Duty: Black Ops 2 only to discover that the second disc was actually Mass Effect 2 have been offered a free copy of the Mass Effect Trilogy by BioWare.

The first fifty consumers affected by the swap who send proof to the developer will receive a code for the PC version of the trilogy, BioWare wrote on its official blog.

“Rumor has it that about a thousand customers who purchased Call of Duty: Black Ops II for PC today were also treated to a surprise copy of Mass Effect 2,” wrote the company.

“If you were one of the affected, chances are you thought it was a mistake, but we prefer to think that it was an omen, and when the universe talks, you should listen.

“If the universe thinks that you should be playing Mass Effect right now, who are we to argue? In fact, we want to help!”