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".
Sonic: After the Sequel
"After the Sequel" is a 2D platformer in the style of the "Sonic" games for the Sega Genesis. As such, it lets the player control either the blue hedgehog Sonic or his orange fox friend Tails. Both characters can move left and right with the arrow keys and jump with the "Z" key; Tails can also fly to reach areas Sonic cannot. The game takes place in seven levels, known as zones, each divided into three acts followed by a boss fight with Doctor Eggman. These zones are designed for fast-paced gameplay, featuring typical "Sonic" obstacles such as bottomless pits and vertical loops. The zones are based on various themes, including haunted houses, cities, magma caverns, winter theme parks, and sugar processing plants.