Dimness – the Dark Side of an Endless Runner Game Dimness is a new, free automatic side-scrolling arcade game that challenges your reflexes and ability to control your character. endless runner, arcade game, action game, reflex test, free game, side-scrolling, platformer, HTML5 game, adventure game, mobile game, challenging game, dodge, jump, power-ups, dark world, endless levels, reflexes, agility, gaming, action, classic, crazy