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Collapse!, not to be confused with the original 1998 game, is a puzzle game developed and digitally published by GameHouse for the PC and Mac on December 9, 2009. The fourth installment of the Collapse! series of "SameGame"-inspired puzzle games and the sequel to Super Collapse! 3, Collapse! features a reworked single-player campaign ("Adventure", which now uses customizable avatars) and new "Double" versions of the game's modes (which uses dual playfields). It also received a mobile port for iOS and Android (Platform) devices alongside the other releases, with a Windows Phone 7 release later on August 21, 2011. Like the previous game, this version uses a smaller 8×10 playfield and does not include the "Double" modes. This version later received a sequel with Collapse! Blast. It also received a free-to-play browser version via Facebook in 2009, with limited game modes and a microtransaction system for power-up access.
The Puzzle, Slider, Continuous, and Countdown modes from the previous installment are not included in Quick Play. All modes, other than the basic Classic mode, are unlockable for Quick Play in the Adventure mode. New to the series are "Double" variants of the game's Classic, Relapse, Strategy, and Continuous modes. These have two separate playfields next to each-other, rarely interacting with each-other (including "Warp Bombs" that launch groups of blocks into the other playfield).