Sonic Jam
"Sonic Jam" is a compilation which contains the four main "Sonic the Hedgehog" games released on the Sega Genesis: "Sonic the Hedgehog", "Sonic the Hedgehog 2", "Sonic the Hedgehog 3", and "Sonic & Knuckles". Unlike future "Sonic" collections, "Sonic Jam" does not use a Genesis emulator; the games are proper ports, and all are nearly identical to the original Sega Genesis releases, with the exception of minor bug fixes. "Sonic Jam" emulates "Sonic & Knuckles" "lock-on technology"—a special feature that allows the player to merge elements of "Sonic & Knuckles" into previous games, resulting in changes to the level design as well as the choice to play as Knuckles the Echidna in "Sonic the Hedgehog 2" and Tails in "Sonic & Knuckles".
Video game console
Sega scaled down and adapted their Sega System 16 (used to power arcade hits like Altered Beast and Shinobi) into the Mega Drive (sold as the Genesis in North America) and released it with a near arcade-perfect port of Altered Beast. Sega's console met lukewarm sales in Japan, but skyrocketed to first place in PAL markets, and made major inroads in North America. Propelled by its effective "Genesis does what Nintendon't" marketing campaign, Sega capitalized on the Genesis's technological superiority over the NES, faithful ports of popular arcade games, and competitive pricing. The arcade gaming company SNK developed the high end Neo Geo MVS arcade system which used interchangeable cartridges similar to home consoles. Building on the success of the MVS, SNK repackaged the NeoGeo as the Neo Geo AES home console. Though technologically superior to the other fourth-generation consoles, the AES and its games were prohibitively expensive, which kept sales low and prevented it from expanding outside its niche market and into serious competition with Nintendo and Sega. The AES did, however, amass a dedicated cult following, allowing it to see new releases into the 2000s. Fourth generation graphics chips allowed these consoles to reproduce the art styles that were becoming popular in arcades and on home computers. These games often featured lavish background scenery, huge characters, broader color palettes, and increased emphasis on dithering and texture. Games written specifically for the NES, like "Megaman", "Shatterhand", and "Super Mario Bros. 3" were able to work cleverly within its limitations. Ports of the increasingly detailed arcade and home computer games came up with various solutions. For example, when Capcom released "Strider" in the arcade they created an entirely separate Strider game for the NES that only incorporated themes and characters from the arcade.