Killzone: Mercenary is coming to the PlayStation Vita on September 10, and today marks the opening of the title's multiplayer beta. The test phase is currently closed, but interested parties will be able to get in without a special code at the end of August.

The team at Guerrilla Cambridge has put together a new developer diary to detail what players can expect. The Valor Card system rewards kills, with more money offered up for taking out someone more experienced than yourself. 

Single-player and multiplayer progress is consistent across modes, so even when you don't have a WiFi connection, you can advance your mercenary. Take a look below.