Controls:
WASD - up, left, rigth,down
Cursors - target up, left, right, down
Mouse - depends on key pressed
    - if WASD pressed mouse is targeting, click to fire
    - if one tank is selected mouse is targeting, click to fire
    - if none above drag mouse to select, click to select
    - right click to fallow/move
0-9 - Group selects, +SHIFT, with CTRL to set
"=/+" - Small random upgrade
"8/*" - Big random upgrade
F/space - fire
I - Instructions on/off
P - pause/resume
N - restart
M - start over