Raiden IV  The gameplay of "Raiden IV" is identical to the previous games. In each stage of increasing difficulty, players maneuver their fighter craft, engaging various enemies and avoiding their attacks. The Flash Shot mechanic, first introduced in "Raiden III", returns in this game. Collectible items include weapon upgrade icons, bombs to cancel enemy attacks and deal damage to enemies over a large area, and score items such as medals and fairies. The Cranassians have returned again after numerous defeats against humanity. The VCD immediately launches a new model of the Raiden fighter, the Fighting Thunder ME-02 Kai, to stop the Cranassians from taking over the Earth. The first location test for "Raiden IV" was held at Akihabara Hey on July 22–23, 2006, on an Egret II system. This version had three difficulty levels and forced a different weapon for each player. The second location test was held again at Hey and at Taito Game World in Shinjuku on October 14–16. The third location test was held at High-Tech Sega in Shibuya and Taito Game World in Shinjuku on December 27, 2006. The version of the game used in this location test allowed players to select a weapon. The fourth and final location test was held at Shinjuku Gesen Mikado on February 20, 2007. Moss launched the arcade version of "Raiden IV" on June 7, 2007, while launching the official arcade website. The first details of the Xbox 360 port was revealed on June 2008. It includes new stages, Xbox Live support, monitor rotation options, and downloadable content. The port was set to be released on September 11, 2008, by Moss, but it was pushed back to October 2 as the game needed more polish and bug fixes. A PlayStation 3 version was announced on December 21, 2013, by Moss. It was released on Spring 2014. This version was the first official European release of the game. The Windows version was announced on June 30, 2015, and released on Fall 2015. This version was designed for the NESiCAxLive arcade download system. The game was unveiled on February 22, 2011, in AOU2011. New features include perfect mode, which incorporates the 7-stage game from the Xbox 360 version of Raiden IV, and background music from the Ultimate of Raiden soundtrack. It has the Fairy character available for use. This version includes two new stages, three different fighters (Fighting Thunder ME-02 Kai, Fighting Thunder Mk-II, Fairy), a new OverKill Mode, and a Replay&Gallery Mode.