So do you think you're the best Xbox 360 gamer out there? Do you like pumping up your GamerScore and showing it off online? Then 360 Voice and Old Spice have the challenge for you. Set your own rules, invite the best players, and even pick your prize!

Basically, all you need is an Xbox 360, and a Gold Xbox LIVE account. Go to oldspiceexperiencechallenge.com to see all of the other challenges made by other gamers and even make your own. The challenges are a race to see who can add the most achievement points to their GamerScore over the course of the contest's duration.

More info:
- Unlike past competitions which require participants to keep track of scores manually through spreadsheets, the Experience Challenge will offer automated GamerScore tracking capabilities.

- Challenges are completely user-defined, from who gets invited to what the stakes will be. Gamers can gamble their points across multiple brackets or go all out in a high-stakes bid to drive to the top of the leader board.

- The Challenge is upping the ante with 20 different prize packages in different tiers, based on the length of the competition and the number of team members involved.

Prize tiers:
Tier 1
- Requirements: 7 day challenge, 5 gamers minimum
- $20 Amazon.com gift card
- 1,600 Xbox Live Microsoft Points
- $20 Best Buy gift card

Tier 2
- Requirements: 14 day challenge, 10 gamers minimum
- $50 Best Buy gift card
- 4,000 Xbox Live Microsoft Points
- Xbox Live Gold Membership (1 year)

Tier 3
- Requirements: 30 day challenge, 15 gamers minimum
- $100 Best Buy gift card
- 8,000 Xbox Live Microsoft Points
- 6 month GameFly subscription

Tier 4
- Requirements: 30 day challenge, 20 gamers minimum
- Year long GameFly subscription
- Xbox 360 HD DVD Player

Again, go to oldspiceexperiencechallenge.com for more info - and get cracking on those achievement points!