Classic game.. but pretty difficult
Definatily a difficult game like others have mentioned, but while playing I found a bug if you press enter on menu screen to begin and then quickly press tab and the up key it will show a highlighted box where you can click enter. If you keep pressing enter while pressing the up, down, left, right keys your score can go all the way up to 50+.
Just thought Id tell you that bug before someone else does anyway I came about it by accident thought you should know.