Two users release games using software gray scale! This technique is made possible by quickly alternating the pixels between white and black so fast that the eye perceives it as gray. Because the refresh of the display and the drawing of the display cannot be perfectly synchronized there is some graphic effects caused by this mode, so it’s not perfect! It is, however, totally amazing and something every Arduboy owner should see!
It should be noted this is somewhat of an undocumented capability of the Arduboy and does cause some flickering of the display. But it’s a small price to pay for for the added capabilities!