Brain Bust is back! Test your gaming knowledge with GameSpot's nail-biting, pulse-pounding trivia challenge. To celebrate the release of one of the biggest games this year, this time around we’re testing you on all things Grand Theft Auto. See how much you can remember from all those hours spent wandering the streets of Liberty City beyond.

Calling all Guitar Heroes! Think you have what it takes to become a rock legend? Sign up now to compete in our Guitar Hero III Rock-tacular, and show off your most amazing licks and riffs. We’ll be flying four finalists out to our studio in San Francisco to compete for a $1000 in prizes!

Calling all Team Fortress 2 teams! Here's your chance to put your warring skills and expertise to good use. In Uber-Destruction, sixteen 5-player teams have the chance to show off their strengths in intense combat with a chance to win $2000 in prizes.

Calling all Forza Motorsport 2 teams! Get your motor running and sign up to show off your supreme racing skills in Driven to Win, and you could win a $700 gift card to Best Buy

GameSpot's Warfare Evolved UT 3 Tournament for the PC platform will have sixteen (16)teams of seven (7) players each playing in Warfare mode. The final players will compete live on GameSpot Tournament TV for $4,000 worth of prizes.

Competing in GameSpot UK's Beta Capital Punishment Gears of War Tournament, 16 three-player teams will go head-to-head. Only two squads will make it to the Finals! These two forces will be pitted against each other in the Finals. Who will survive the onslaught of bullets and chainsaws and go home with a cut of the £300 package?

In Humanity's Last Hope, 128 10-player teams have the chance to demonstrate their skills as dedicated soldiers battling against a seemingly unstoppable evil: a band of ferocious Chimera spreading a deadly plague.

Here's your chance to show off your strategic skills and battle it out in GameSpot's Soviet Showdown.

In Stride's Saving Vegas Tournament, 16 six-player teams will have the chance to show off their skills and compete for bragging rights as the best Rainbow Six Vegas crew on GameSpot. Only the teams with the best skills have a chance to advance to the next match. Do you have what it takes?

In Stride's Saving Vegas Tournament, 16 six-player teams will have the chance to show off their skills and compete for bragging rights as the best Rainbow Six Vegas crew on GameSpot. Only the teams with the best skills have a chance to advance to the next match. Do you have what it takes?

Test your extreme racing skills in GameSpot's MotorStorm™ Tournament Challenge on the PLAYSTATION® 3. In this brutal MotorStorm™ competition, you will compete against 79 online racers in an intense off-road racing challenge. The top four players will be flown to San Francisco for the race finale, but only one player will be duly rewarded with the $1,000 prize package.

Competing in Assassination mode, 64 players will go head to head in battle. Only three players will make it to the finals! These three finalists will be pitted against each other in a free-for-all match to determine who will be crowned The Last Commander Standing.

Take command of a massive army as you go head-to-head against your opponents in our Medieval II: Total War (PC) Tournament for a chance to score $1,000 in prizes. In your quest for power and reign, the stakes are high and strategy is as critical as the sword.

Survive intense combat as you maneuver through the chaotic Las Vegas streets in our Rainbow Six® Vegas (PC) Team Tournament for a chance to score $1,500.

Are you brave enough to compete in GameSpot’s Fragophobia Tournament? It's heart-pounding action that may haunt you in your dreams.

The fury of Mortal Kombat is back, so get ready for some fatalistic one-on-one fighting in our $1,000 Mortal Kombat: Armageddon™ (Xbox) tournament.

Think you've got what it takes to command your army to the top and win the $600 grand prize? Then register and prepare for an all-out war!

16 five-player teams will fight for the chance to score a trip to San Francisco for the exclusive GameSpot After Hours gaming event in our subscriber-only BF2 (PC) tournament.

Take a shot at the second installment of Stride's Counter-Strike: Source tournament. 48 five-player teams will battle for the chance to advance to GameSpot's After Hours event and compete for the $1,000 grand prize.

The first leg of Stride's Counter-Strike: Source tournament begins with the combined might of 48 five-player teams, but only one skilled team will advance to GameSpot's After Hours event to compete for the $1,000 grand prize.

16 teams will compete for the top prize and bragging rights as the best Call of Duty 2 squad in our $2,000 Call of Duty 2 (Xbox 360) tournament.

16 strike teams will battle it out in GameSpot's Fight the F.E.A.R. Capture the Flag tournament for the $1,000 grand prize!

This online event will have 16 five person teams battle it out in single elimination to determine the best Call of Duty 2 team and the winners of $2,500 in prizes.

Race hard to get on the leaderboard in this online NASCAR tournament, where the top finishers will share a $2,500 purse.