Loopz is a puzzle video game originally designed and programmed created by Ian Upton for the Atari ST in 1989. Ian Upton had previously worked as head game designer for Audiogenic, who acquired exclusive rights to the game, then in 1990 arranged for Mindscape to publish the computer game in North America and console versions worldwide.
The main focus is on the playing board where random pieces of different shapes are presented to the player. A shape is either a single square containing a straight line or 90° corner or a combination of multiple such squares. The player must then try to make loops out of them. Once a loop is completed, all pieces involved disappear.
There exist three different play modes, two of which can be played with two players. The third mode of play starts with a loop already created and then takes away random pieces of it, so the player has to put them back in after they show up.
Source: Wikipedia, "Loopz", available under the CC-BY-SA License.