Sonic Generations is a platform game in which players control two variants of Sonic the Hedgehog: "Classic" or "Modern". Classic Sonic's gameplay is restricted side-scrolling gameplay similar to the original Sonic the Hedgehog games released in the 1990s, and requires him to use moves such as the Spin Dash and the Spin Attack. Modern Sonic's gameplay follows the gameplay style of Sonic Rush (2005), Sonic Unleashed (2008), and Sonic Colors (2010), featuring an amalgamation of third-person and side-scrolling perspectives and techniques such as boosting and homing attacks. Both Sonics collect rings as a form of health, and power-ups such as elemental shields, invincibility, speed shoes, skateboards, or Wisps. Players can also customize each Sonic's abilities, and purchase additional ones at a Skill Shop.
The game's main hub is a realm called White Space, which the player can explore, converse with other characters, and access the game's nine levels, each of which are derived from a previous entry in the series. The levels are split into three separate eras: the Classic Era (focusing on levels from games for the Sega Genesis); the Dreamcast Era (focusing on levels from games for the Dreamcast, GameCube, Xbox, and PlayStation 2); and the Modern Era (focusing on levels from games for the Wii, Nintendo DS, Xbox 360, and PlayStation 3). Each level consists of two acts (one for each Sonic), and ten additional missions such as collecting a certain amount of rings or completing a level with the help of another character.
Upon reaching the end of the level, players are given a grade based on their performance, with an "S" rank being the best and a "D" rank the worst. After completing an era, players must defeat two bosses: a "rival" character and a main boss. Defeating each boss gives the player a Chaos Emerald, and once the game has been completed, both Sonics can transform into their super forms by collecting 50 rings in a normal level. As Super Sonic, the player is invincible and their speed is greatly increased. However the Sonics lose rings while in this form, and will revert to their standard form when all the rings are gone.
Hidden around each level are five Red Star Rings. Collecting these unlocks concept art, music, or, if all are collected, a new ability. The concept art, as well as cutscenes and character profiles, can be viewed in a Collection Room, while music can be set to play in any level, mission, or boss. The game also features two forms of online leaderboards: "Ranking Attack", which challenges players to obtain the best time and score on each level, and "30 Second Trial", which challenges players to see how far they can get through a level in 30 seconds. The original 1991 Sonic the Hedgehog game can be unlocked in the console versions of the game.
Plot
After being defeated by Sonic, Doctor Eggman is left stranded in outer space with his robot henchmen Orbot and Cubot. A mysterious time-traveling entity known as the Time Eater appears; Eggman, realizing its potential, uses it to go back in time and team up with his past self. The two convert it to a robot to erase their past defeats from history. The Time Eater proceeds to attack Classic Sonic as he travels through Green Hill at the beginning of the original Sonic the Hedgehog, and interrupts a birthday celebration being held for the present ("Modern") Sonic by his friends, scattering them. Modern Sonic awakens in White Space and rescues Tails after traveling through Green Hill.
Modern Sonic and Tails eventually meet their Classic counterparts, and form an alliance to restore their world. The two travel through locations from their past they find in White Space, restoring them to normal. They rescue many of their friends, including Knuckles, Amy, Rouge, Cream, Blaze and the Chaotix, while battling old enemies for the Chaos Emeralds. Both Sonics eventually confront the two doctors, who overpower them using the Time Eater. However, the two Sonics use the Chaos Emeralds to transform into their super forms and defeat the Time Eater, restoring the timeline to normal. Everyone resumes celebrating Modern Sonic's birthday while Classic Sonic and Tails bid farewell and return to their time. Meanwhile, both Classic and Modern Eggman are left trapped in White Space.
Reception
The console and PC versions of Sonic Generations received "generally favorable reviews", according to review aggregator Metacritic. The game was also successful commercially, selling 1.85 million copies worldwide across all platforms by May 2012.
The game's presentation was well received. Nathan Meunier of GameSpot called the graphics arguably the best of the series, praising the detail put into recreating each level; this statement was echoed by Tim Turi of Game Informer. Jack DeVries and Brian Altano of IGN offered similar praise for the visuals, and described its remixed tracks as "cool" and its sound effects as "spot on". Tom Bramwell of Eurogamer felt Sonic Generations was a worthy tribute to the Sonic franchise, though he still considered the franchise's previous entry, Sonic Colors, to be better.