This game featured the debut of Sonic, and Robotnik (Eggman) and it started a fiasco for Sega...

 

1992: Sonic the Hedgehog 2 (Genesis)

...Less then 1 year later this baby was released, with more levels, faster, and better color then its father, it sold over 200,000 in 2 days, it introduced Miles "Tails" Prower, and Metal Sonic...Lets not forget Super Sonic...

 

1993: Sonic CD (Sega CD)

...This game is by far the best game in the series and im not the only one that seems to think so, It featured new graphics, Amy Rose, Sonic's self-appointed girl-friend and stalker, and the deadly Mecha Sonic...

 

1994: Sonic the Hedgehog 3 (Genesis)

...By this time Sonic's popularity had sky-rocketted, He had some wicked friends, and ugly nemesis, and a stalker, and in this game we introduce Sonic's rival, and good friend, Knuckles, in this game Robotnik tricks Knuckles into thinking that Sonic has came to Angel Island to steal the Master Emerald...

 

1994: Sonic and Knuckles (Genesis)

...Less then one year later Sega shocked America with this fancy lock-on game. With it you can play through Sonic 2, and 3 with Knuckles. But thats not the only reason Sega released this smash-hit. It literally takes place right after the 3rd game. Im not gonna spoil it for you, but i'll tell you this, you find out why Sonic and Knuckles became the fantastic team they are today...

 

1996: Sonic 3D Blast (Genesis, Saturn)

...Nothing really happened in this game except one major change, Oh jeez how did you know, But yeah Sonic is literally in 3D, Great graphics for the Genesis, but, sadly, it didnt carry the magic from is fore-fathers...

 

1997: Sonic Jam (Saturn)

...Sonic grows more realistic in this game, take a look at the new Sonic, more realistic then ever...

 

1999: Sonic Adventure (Dreamcast)

...Sonic dominates in his first ever "Adventure" and Sonic and Pals get a new look, With Edge-On-Your-Seat graphics, wicked fast speeds, and an ever growing plot, Sonic truely brings out his potential in this game...

 

2001: Sonic Adventure 2 (Dreamcast)

...Combining the feel and plot of Adventure, and the level set-up similar to the classics, and it brings in two new characters, the evil and mysterious Shadow, and the sexy Rogue, this game truely leaves a mark in the Sonic series...

 

2002: Sonic Advance (Game Boy Advance)

...Sonic's first platform game in years, and his first on the GBA, Sonic seems to be faster then he was on the Genesis...

 

2002: Sonic Adventure 2: Battle (Gamecube)

...A simple remake of Sonic Adventure 2, except you dont have to unlock the 2-Player battle mode...

 

2002: Sonic Mega Collection (Gamecube)

...Wow a blast from the past =). Truely a great game, completely flawless, exceot for one tiny problem...NO SONIC CD...

 

2003: Sonic Advance 2 (Game Boy Advance)

...Basically the same as the other Advance game, only the levels are longer ,you have to unlock the Tiny Chao Garden, and it introduced Cream the Rabbit (?!)...

 

2003: Sonic Adventure DX (Gamecube)

...HOLY!!! Sega hit us hard with this one, we expected just another remake, well...it actually WAS just another remake, but this time the graphics are better, Sonic is faster, and it has Game Gear games on it, which ones are you asking? Well...go pay 39.99$ and find out...