The scenario is static, you only need the mouse to play this game.
Terrorists will appear from different places on screen and you'll have to aim and shoot them.
Be careful because there are hostages too. You fire with the left button and you rescue hostages with the right button.
Counter trike fans will realize that the environment is a part of the famous 'CS_Militia' map, a classic of the 1.6 version of Counter Strike.
Little Counter Strike is an amusing game with a good surprise at the end of the game.