Truly, one of the best free downloadable games there is.
Desgined as a cross between games such as worms, counterstrike and other platform games, the result is magical.
With multiple weapons to choose from, all with different characteristics, and all perfectly balanced, so one is no more powerful than the next, a multitude of maps to play on, and multiple styles of gameplay, including capture the flag, infiltration and deathmatch, all make for an exciting game.
When you factor in the options of advance mode, realistic mode, and survival mode (ala counterstirke), then the options for gameplay become even more in-depth.
Soldat is predominantly played online, although offline play versus bots is also accessible. At the current time, around 300 servers can be found at any one time, and servers close to your region offer little to zero ping games.
Great fun.