factor. The floors' appearances change every 100 floors until floor 1000. Floors 0 - 99: Stone Floors 100 - 199: Ice Floors 200 - 299: Wood Floors 300 - 399: Metal Floors 400 - 499: Chewing gum Floors 500 - 599: Bone Floors 600 - 699: Vines Floors 700 - 799: Pipe Floors 800 - 899: Cloud Floors 900 - 999: Rainbow Floors 1000 and above: glass High scores Icy Tower records players's best results in built-in high-score tables. Scores are recorded in several categories including highest score, highest floor and longest combo. Players may also publish their scores in online high score lists which may require players to provide game replays to verify their results. The official Icy Tower list is on Free Lunch Design's web server. Development Free Lunch Design created Icy Tower using the C programming language and the Allegro game library. Its designers were inspired by Xjump, a game for the Linux operating system. Ports On March 14, 2007, a press release was published on the Free Lunch Design website announcing a partnership between FLD and mobile game developer Xendex Entertainment for the porting of Icy Tower to the mobile environment. Icy Tower Mobile (ITM) was released on October 6, 2008. Due to the then-current limitations of mobile platforms, the game lacked several features in its PC counterpart, such as recording or sharing replays, and changing game characters. On September 24, 2009, a Free Lunch Design game named Icy Tower Facebook (ITFB), developed on the Adobe Flash platform within the development framework of the Facebook social networking website, was released. It allows players to compare their results with results of their friends within the Facebook system. Players can also personalise their in-game avatars and unlock additional game levels (so-called towers) corresponding to various game styles in the PC version of Icy Tower by exchanging them for coins, the game's virtual currency. In November 2012, an official continuation of Icy Tower, Icy Tower 2, was released for iOS and Android. The producer estimates that on November 23, 2012, the number downloads of Icy Tower 2 downloads surpassed one million. There are also unofficial, player-developed Icy Tower ports for the Nintendo DS and PlayStation Portable game consoles. Reception Icy Tower ranked high in the "Most Popular" ranking of the "PC games" section in the Download.com software directory website; its average monthly number of downloads was "more than 20,000"