It includes the main Mega Drive/Genesis anthology (including Sonic & Knuckles and its lock-ons); and two spin-off games, Sonic Spinball and Sonic 3D Blast are not featured. The compilation also includes a 3D "Sonic World", which allows players to access virtual museums featuring Sonic the Hedgehog history, art, video game music and advertisements, as well as remastered and uncut animation sequences from Sonic CD. Sonic World functioned as both a hub for the extras and as its own game, utilizing missions such as ring-collecting, reaching markers, or finding Tails. Completing all the missions would unlock the credits for Sonic Jam.
Games included in this collection are:
Furthermore, by selecting Sonic & Knuckles, the player can use the "lock-on technology" from its original cartridge version in order to link up to the other three games in the collection, making the following games also playable:
Sonic Jam also included customized versions of the games, with redesigned levels with varying levels of difficulty. When played in "Original" mode, the games are identical to their original Mega Drive/Genesis releases. "Normal" difficulty adds extra rings and alters other aspects of the design to remove some of the challenge (these versions of the levels are used when playing Sonic Jam's Time Attack feature). "Easy" difficulty removes certain stages entirely, making the game much easier to complete.
Also implemented into Sonic Jam was the option to use Sonic's signature move, the Spin Dash, in Sonic the Hedgehog (on any of the above difficulties); originally, it did not debut until Sonic 2. There were also fixes of some glitches, particularly in Sonic 3. The games were not simply direct emulations like in later compilations, but rather elaborate ports to utilize the Saturn hardware.
The Game.com version is completely different. Due to space limitations, Sonic 1 is not present, and each "game" consists of 4 levels based on the first level of the respective game (Emerald Hill, Angel Island, and Mushroom Hill). Sonic, Tails and Knuckles are playable for all games, and Tails can fly, but Knuckles can't glide or climb. Curiously, this version's box art features the same render found on that of Sonic R.
Some of the audio is presented slightly different than they originally were on their original system. This is due to the CD format. The version of Sonic 2 in this compilation uses the Invincible tune from Sonic the Hedgehog, though the VS mode does use the original game's Invincibility. The speed-up music is also a separate track on the CD, so the game restarts the level music when that power-up is used. There are also some enhanced sound effects, particularly in Sonic 3 and Sonic & Knuckles where the sound effect for explosions (from monitors and enemies) is completely different. While the graphics are replicated perfectly on the Saturn, there is one additional visual effect in Sonic 1. While Sonic halts to a stop while running, he leaves behind skid marks just like in later games. This is actually not a brand new graphic. It is unused within the original game's ROM, but never implemented in the game. So far, Sonic Jam contains the only version of the original Sonic the Hedgehog where this lost graphic appears.
Some of the port implemention is imperfect, however. In some moments, slowdown does occur where it did not in the original games. If too many sound effects are going on at once, the sound may glitch up and sound unnatural. If the player crashes the game in debug mode of any game, the entire CD freezes as well. Finally, there are some additional graphical errors, most notably in Sonic 3 & Knuckles - if Knuckles manages to trigger Eggman as his opponent in Mushroom Hill Zone, the fought character will use both Eggman and EggRobo's sprites, making the boss a weird mash of both. Despite the discrepancies in the ports, Sonic Jam is still considered one of the best Sonic-themed compilations due to its wealth of extras.
Sonic Jam received generally positive reviews, holding an aggregate score of 77% at GameRankings, based on four reviews.
- In the Japanese version, the Character House lists Sonic's age as "15〜16", but the North American and European versions list his age as simply "16". Sonic's age would be officially established as 15 as of Sonic Adventure.
- An out-of-bounds glitch is present in Sonic World, where the player can find their way out of the stage and find endless land stretching in front of them.
- This game consists of one of the few times the name "Eggman" appeared outside Japan before Sonic Adventure.
- Conversely, it is the only time the original full name "Ivo Robotnik" appeared in Japan.
- The music that plays in the virtual museum is used again in Sonic Generations and is itself a more mellow remix of the Sonic the Hedgehog 3 "File Select" theme.
- Unlike the Saturn versions of Sonic 3D Blast and Sonic R, Sonic Jam did not get a port to Microsoft Windows personal computers, making this the only Saturn Sonic game to not be released on that system.
- LucasSaturn (31 October 2014). The Sonic Adventure Beta. Retrieved on 17 April 2018.