It's a curling simulation game. You can do almost everything you do playing curling - throw the rock, curl, sweep, enjoy. Press & hold the stone to gain power (watch the indicator in the up-left corner of the screen), release it to push. Sweep the ice in front of the stone while it is moving to change its direction & speed. Before you press the rock, you may choose the throw direction picking it in the "house" (see the "first step" screenshot) & also you can change the torque (rotation) of the stone pressing the ice in front of it for 1..9 times (see the "second step" slide). Have fun!