This spring, Left 4 Dead 2 characters, including the survivors and the Witch and Mini Tank infected, will make their way into Resident Evil 6's The Mercenaries No Mercy mode, while enemies from RE6 (Lepotitsa, Napad, and Ogroman) will appear in Left 4 Dead 2.

RE6 owners will get to play the new content in that game starting April 5, while the L4D2 update will arrive in a more Valve Time-compliant "spring" release window. Both crossovers will be free to download for owners of either game.

There, now the stuff with the Xi3 computer is no longer the most baffling news to come out of Valve in the last month.