Metal Gear Online is a dedicated online title released with Metal Gear Solid 4: Guns of the Patriots, an exclusive title for PS3, which took the market by storm on its release in June. Featuring characters, weaponry and levels taken from and inspired by Metal Gear Solid 4, Metal Gear Online allows up to 16 people to play simultaneously. The online game retains the famed stealth combat gameplay of the Metal Gear series, players are dropped in a series of war zones wherein different challenges await.

Metal Gear Online 24-hour Survival Challenge which is open to all registered MGO players to enjoy over a 24-hour period. Players will be awarded Reward Points based on their team's winning streak. Players are not recommended to play for an extensive duration of time due to health risks.

The challenge will be held once a month for the next four months with the scheduled dates currently set for November 28, December 26, January 23, 2010, and February 27, 2010. Participants will need to log into the game during the 24-hour period and select to join a Survival lobby to participate in the challenge and the numbers will be capped at approximately 3,000 total players (exact number will be subject to server capacity). All participants will receive a specific in-game Regain® T-shirt while different levels of Reward Points will be given for each team's achievement. Players who participate in all the events and collect all four Regain® T-Shirts will receive the special Regain® Hat! Players do not need to play for the full 24-hour period to receive the prizing. To be eligible for the prizing players would need to log into the game and join a Survival game for the minimum of one round. The regularly scheduled Survival games for November 25, December 23, January 20, and February 24 will be canceled to prepare for the special 24-hour Survival events.