Mercury Hg is a video game that builds on the addictive qualities of its predecessors. It features 60 all-new levels filled with hazards and obstacles, as well as improvements and polish to almost every aspect of the game. The player controls the 'Mercury Blob', which can change color in order to progress through the level, or divide if cut by a protruding surface. Players must use balance and momentum to navigate strategically through slippery objects and sticky tiles, in order to reach the finish line with their blob intact. A scoring system with full online leaderboard support adds a competitive element while pulsing and reacting to music from the players library in real time enhances an already engrossing single-player experience.