Velocibox

Velocibox is a twitch-heavy action game crafted squarely for a hardcore audience. You flip, spin and dodge your way through more than 70 deviously designed patterns, where the slightest mistiming ends a run.

The game makes no concessions to difficulty. Beyond the main set of patterns, an insanely hard Super Velocibox mode waits for the uber-hardcore, and the game proved punishing enough that the developer was, affectionately, called a filthy drug dealer for how addictive it is.

Its brutal challenge made it a popular feature in YouTube playthroughs from creators like UberHaxorNova, Markiplier and jacksepticeye, who variously described it as one of the hardest games they had ever played.