Sinkhole urban areas due to water main breaks or sewer collapses when old pipes give way. They can also occur from the overpumping and extraction of groundwater and subsurface fluids. Sinkholes can also form when natural water-drainage patterns are changed and new water-diversion systems are developed. Some sinkholes form when the land surface is changed, such as when industrial and runoff-storage ponds are created; the substantial weight of the new material can trigger a collapse of the roof of an existing void or cavity in the subsurface, resulting in development of a sinkhole. Sinkholes tend to occur in karst landscapes. Karst
Collapse! Collapse! Collapse! is a series of award-winning tile-matching puzzle video games by GameHouse, a software company in Seattle, Washington. In 2007, "Super Collapse! 3" became the first game to win the Game of the Year at the inaugural Zeebys. The series has been discontinued since 2015 due RealNetworks shutting down its internal games studio. In 2006, a spin-off series called Super Collapse Puzzle Gallery! was developed into 5 games. The classic "Collapse!" game is played on a board of twelve columns by fifteen rows. Randomly colored blocks fill the board, rising from below. By clicking on a group of 3