http://fenglee.com/game/aog/Attack on Titan (tribute game) is a multiplayer game made by Feng Lee and based on the popular anime/manga series: Shingeki no Kyojin. It is web based, and you only need the install Unity player to play it.
Like the anime/manga, the world is overrun by giant human-like monsters that have the sole purpose of eating all humans. While on the edge of extinction, the humans do all they can to face off against the almost invincible titans. Their only weak point is the back of their necks. Try to reclaim their city using 3DMG which allows humans to break from their basic two-dimensional movements and move in three dimensions.
There are two main maps, City and Forest, and multiple modes for each. You can play as characters from the series including Mikasa, Levi, Armin, Marco, Jean, Eren, Petra, and Sasha (as of 07/10/2014). Each player has their own stats and special moves based on their skills you can find one that fits you well. Although I can say a bit more about the game, it might be best if you play it yourselves and decide how you should feel about it.
If you are playing and want to link up, set your guild to DollarsBBS! Have fun, and don't get hurt! Thanks to Shiro W. for the description.