The game purpose – to calculate a trajectory and to move nodal dots so that an initial blue dot reached a final green dot.

The trajectory of flight occurs on arches of circles, in nodal dots these arches adjoin. Parameters of each arch are determined by two dots and an angle of entry in the first dot. The initial corner sets a cue (a green dot with the green continuous line).

To start flight it is necessary to press a blue dot. To move nodal dots and a cue it is possible the movements in any part of the screen (the current dot is highlighted in the red color).