2D clone of the first person shooter Counter Strike.
You can play it like Counter-Strike by Valve Software. Plant and defuse bombs, rescue hostages or escort the V.I.P. In addition to the original Counter-Strike map types (as, cs, de) you can play some new map types like ctf (Capture the Flag) or dom (Domination). There's also a construction mode in CS2D. Build walls, barbed wire and turrets to protect your base. Even a zombie mode is included.