The erasure of some shapes may cause other shapes on top of it to gravitate directly downwards in their column. When this happens, the shapes disappear, give the player a sum of points to add to their score, and subsequently make empty space on the grid for other shapes. The general aim for all game-modes is to align two or more of identical shapes in any fashion as long as they lie adjacent to each other inside a 13x7 grid. The falling shapes used in gameplay include a red tetrahedron, a pink cross, a green gemstone, an orange octahedron, a white gemstone, a yellow tetrahedron and a blue sphere. Sonic the Hedgehog, controlled by the player, must arrange randomly selected falling clusters of shapes of the same variety to align on a grid in order to erase them. It also features a large cast of other characters such as Doctor Ivo 'Eggman' Robotnik, Miles 'Tails' Prower, Knuckles the Echidna, Amy Rose, Shadow the Hedgehog, and the Chao creatures.Ī falling block puzzle video game, it became available for download in Japan in 1991 and in Brazil in 1995 on Sega Meganet, a Japan-exclusive Sega Mega Drive add-on released in 1990 and later released in Brazil in 1995 that enabled players to download a select library of games via dial-up internet. Each game focuses on the titular protagonist Sonic the Hedgehog, an anthropomorphic blue hedgehog. The most popular games in the franchise are platform games, although the series also includes other genres such as racing video games, fighting games, action-adventure games, role-playing video games, and sports games. As of March 2011, the series has collectively sold 89 million copies worldwide across both the platform games and spin-offs. However, some of the original games were ported into versions on newer third-party home consoles and developed by various companies.

In its earliest history, most Sonic the Hedgehog games had been platform games released for Sega video game consoles and handheld game consoles (handhelds), dating from the Sega Genesis to the Sega Dreamcast. The series debuted in 1991 with the video game, Sonic the Hedgehog, released for the Mega Drive video game console (named Sega Genesis in North America). It is published by Sega, with entries developed by Sega, Sonic Team, Dimps, SIMS Co., Ltd., BioWare, and Sumo Digital. Sonic the Hedgehog is a video game series.

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