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Windows 9xAndroidiOSWindows Phone |genre=Platformer |modes=Single player |platforms= }} , or , is a platform video game developed by Sonic Team and published by Sega originally for the Sega/Mega-CD in 1993. It is the first game in the ''Sonic'' series to make use of the CD-ROM format, featuring high quality audio and full motion video. Development began in Japan around the same time as ''Sonic the Hedgehog 2'' in the United States. Originally, the games had many similarities, but over time became vastly different projects.〔 The story of ''Sonic CD'' follows Sonic the Hedgehog as he utilizes time travel to save Amy Rose and Little Planet from Doctor Eggman and Metal Sonic. The game features the debut appearances of Amy Rose and Metal Sonic, both of whom have gone on to become recurring characters in the ''Sonic'' series. Time travel is a key aspect to both the story and gameplay, with nearly every stage containing four different variations (one for each time period) featuring alternate stage layouts, music, and graphics. Since release, ''Sonic CD'' received universal critical acclaim, being considered both one of the best platform and Sega/Mega-CD games of all-time.〔〔〔 It was ported to Microsoft Windows 9x as part of the Sega PC brand in 1996, and to both the PlayStation 2 and GameCube as part of the ''Sonic Gems Collection'' in 2005. An enhanced port of the game was also released for Xbox Live Arcade, PlayStation Network, iOS, Android, Windows, Windows Phone, and Ouya. ==Gameplay== ''Sonic the Hedgehog CD'' is a platform game in which the player character is the titular Sonic the Hedgehog. The goal of the game is to collect seven Time Stones and defeat Sonic's nemesis Doctor Robotnik. Along the way, Sonic can collect rings, which can protect him if is he hit by an enemy or obstacle, as well as items such as shields, invincibility and speed shoes. Sonic's gameplay remains similar to that of ''Sonic the Hedgehog'' but with the addition of the Spin Dash and the Super Peel Out, which lets him zoom into a quick speed from a standing point, either in a rolling or running position. The Super Peel Out is faster than the Spin Dash, but leaves Sonic more vulnerable. Each of the game's seven themed zones is divided into three "acts": two main levels and a boss level. The main gameplay mechanic that sets ''Sonic CD'' apart from other ''Sonic'' games is a time travel system that enables players to move between different time periods within each level. By hitting posts labeled "past" or "future" and then keeping a consistently high speed for several seconds, Sonic can move between past, present and future level variants. The time travel posts are only present in the first two zones of each stage; boss zones always take place in the future. The game contains four different variants of each zone ("past", "present", "good future" and "bad future"), each of which features different graphics, music, and layouts of platforms, enemies and obstacles. By default, traveling to the future will take Sonic to a "bad future" version of the current level, an industrialized dystopia with scenery themed around neglect and decay, in which enemy robots exhibit signs of degradation. Therefore, players are encouraged to convert each zone's timeline to a "good future": a utopic technogaian scenario in which technology and nature are symbiotically fused into a sustainable, colourful environment, and in which there are no enemy robots. In each non-boss zone, a good future can be attained by traveling to the past and destroying a hidden "robot generator". If a good future is achieved in ''both'' of a stage's non-boss zones, that level's boss fight will also take place in the good future. Similar to ''Sonic the Hedgehog'', if a player has more than 50 rings by the end of the act, a giant ring appears that can take Sonic to a Special Stage if he jumps into it. On a three-dimensional plane, the player has a short amount of time to destroy several purple flying saucers floating around the level. Time is quickly reduced if the player runs through water, though a blue flying saucer which appears when time is running out can grant extra time if destroyed. If the player is able to destroy all the purple flying saucers before the time runs out, a Time Stone is earned. A good ending can be achieved by collecting all seven Time Stones, or by achieving a "good future" in every act. The player will also automatically achieve a "good future" in any level if all the Time Stones have been collected. ''Sonic CD'' contains a "backup save", using the internal Mega-CD memory or a backup RAM cartridge. The game saves after the end of each third zone (after which, a new level begins) and records the best times of the player in the time attack mode. In the 2011 enhanced port, the game is saved at the end of each zone. The game also features an instant game over scenario: if the game is not paused and is left alone for three minutes, Sonic will leap off the screen. In the 2011 version, players are also able to control Miles "Tails" Prower after clearing the game once.〔(【引用サイトリンク】title=SEGA Blog | Sonic CD Spins Onto Tablets at GameStop )〕 He basically has his moveset from ''Sonic the Hedgehog 3''. As with Sonic, Tails can use the spin attack, spin dash, along with his ability to fly by spinning his tails like helicopter rotors and also swim, but is unable to use the Super Peel Out and cannot be used to earn achievements. Players also have the option to utilize the Spin Dash physics from ''Sonic the Hedgehog 2''. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sonic the Hedgehog CD」の詳細全文を読む スポンサード リンク
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