If you want in on the multiplayer beta for Sony's PS Vita shooter Killzone: Mercenary, act fast. Registration has begun and will only last until this coming Wednesday.

According to the PlayStation Blog, you have until 2 p.m. PDT on Wednesday, July 17 to sign up. An unspecified number of applicants will be selected to be a part of the closed beta. If you are chosen, you will receive an email detailing instructions on how to participate.

Watch some gameplay footage of Killzone: Mercenary below and check out our previous hands-on impressions of the game.

To register for the beta, head over to the sign-up page.

[Source: PlayStation Blog