HG meaning in Medical ?

Mercury Hg is a puzzle-platform game developed by British studio Eiconic Games and published by UTV Ignition Games. It is the third entry in the Mercury series. The goal is to navigate a blob of mercury to a goalpost by tilting the stage without losing all of the mercury. The mercury can be split apart into multiple blobs, change colors using Paintshops, and be remerged into a new color. In addition, the game utilizes an online leaderboard, ghost sharing, and the ability to insert music into the levels.

The game was released in North America on September 27, 2011, on PlayStation 3 via PlayStation Network and in Europe the following day. The Xbox 360 version was released via Xbox Live Arcade internationally on October 19, 2011. In addition, the game received two DLC packages titled "Heavy Elements" and "Rare Earth Elements". The game was praised for its visual style and level designs but was criticized for being too easy and lacking features from its predecessors.