Warcraft III Frozen Throne's Dota Allstars (Dota stands for Defense of the Ancients) is a game that can be played by up to 10 people. My experience with it has been very fun and addicting! Even though I've been playing this for more than 3 years now, I still can't get enough of it.
You are given one hero, which you select from 8 different taverns, that you can control. Each hero hashis own strengths and weaknesses, as well as specific sets of skills that you can upgrade when you get more experience. There are two sides, the Sentinel and the Scourge, which resembles good and evil forces, respectively. The goal is to destroy the source of power of the enemy, that is, the Tree of Life for the Sentinel, and the Frozen Throne for the Scourge.
This game entails teamwork, presence of mind, patience, tactics, and complex strategies. It can be very fun, because the outcome will be very exciting to determine. Whenever I play this game, I feel the adreline and excitement.
A usual game takes about an hour, then you would normally do a rematch and determine the bet of three. There are international DotA competitions, and thereyou will see the best of the best, both in player skills and in team skills.
I suggest you play it over Garena instead of Battlenet. Garena is way faster, and there are less lags and delayed actions. They have several tools to help fix connection problems, such as their Tunnel, Anti-Spike, and Optimize Connection features. Through Garena, you can play with players coming from various places in the world.
Don't try this one unless you want to get hooked!