Grayscale

You can view your presentation in grayscale or black-and-white and then customize how the various colors are translated to grayscale or black-and-white.

Tetris’s graphics were simple enough to work on the Game Boy’s small gray-scale screen; its motion was slow enough not to blur; its action was a repetitive, storyless puzzle that could be picked up, with no loss of potency, at any moment, in any situation.