Reckon you're the John Rambo of Call of Duty: Black Ops? Developers Treyarch are giving PS3 users a chance to prove their worth as virtual soldiers by stepping onto the battlefield against the very people who built the game.

In order to take part, PS3 users must have downloaded the First Strike map pack, which includes four new maps for the mutliplayer, plus one new map for the Black Ops zombie mode.

To get in on the gun-toting action, PlayStation users need to send a friend request or invite to the any of the following PSN IDs:

Treyarch_A
TreyarchB
TreyarchC
TreyarchD
TreyarchE
TreyarchF
TreyarchG
TreyarchI

The games will take place from 8pm tonight until 1am tomorrow morning. Lock and load, soldier.

Call of Duty: Black Ops trailer