Skill & Precision Games · 59

Difficulty curves work best when they remix known ideas; a new obstacle is easier to learn if one part of it already feels familiar. The category's past supplies the companion fact: A frame at 60 frames per second lasts about 16.7 milliseconds, which is why a 'one-frame window' is both tiny and extremely memorable. The cruelest leaderboard position is second because it comes with exact instructions for what still hurts.