Classic Era:
Sonic the Hedgehog (1991)
Sonic the Hedgehog 2 (1992)
Sonic the Hedgehog 3 and Knuckles (1994)
[Sonic CD (1993) is considered to be a canon game, however it's speculated as to whether it's before or after Sonic the Hedgehog 2 due to the lack of Tails, yet being produced at the same time as Sonic the Hedgehog 2.]
Sonic the Hedgehog 4 (2010) [Although technically a modern game, it's set to take place after Sonic 3 and Knuckles, making it placed here storyline wise.]
There are also numerous other 2D releases, however the time in which they take place isn't established, but some listed in order of release date, so presumably in the Sonic universe's chronoglogical order are:
SEGASONIC the Hedgehog (1993)
Sonic Chaos (1993)
Sonic the Hedgehog Triple Trouble (1994)
Sonic 3D Blast/Sonic 3d: Flickies' Island (1996)
Sonic Blast (1996)
Modern Era:
Sonic Adventure (1998)
Sonic Adventure 2 (2001)
Sonic Advance (2001)
Sonic Advance 2 (2002)
Sonic Heroes (2003)
Shadow the Hedgehog (2005)
Sonic Battle (2003) [Takes place after Shadow the Hedgehog, due to Shadow having his memory, and Rouge's acknowledgement of Omega.]
Sonic Advance 3 (2004) [Takes place after Battle due to Gemerl's existence.]
Sonic Rush (2005) [Speculative as to where this game belongs. Either before, or after Sonic the Hedgehog 2006.]
Sonic Rush Adventure (2007)
Sonic the Hedgehog (2006)
Sonic Rivals (2006)
Sonic Rivals 2 (2007)
Sonic Unleashed (2008)
Sonic and the Secret Rings (2007)
Sonic and the Black Knight (2008)
Sonic Colours (2010)
Sonic Generations (2011)
Sonic: Lost World (2013)
The remainder of the games are generally spin-offs that could fit just about anywhere in the series.
Free Sonic games can be found on a number of websites. Sonic Games, Daily Games, Games List, and One Online Games all feature free online Sonic games.
Here are the Sonic games for the Wii: Sonic and the Secret Rings, Mario and Sonic at the Olympic games, Sonic Unleashed, Sonic and the Black Knight, Sonic Riders Zero Gravity, Sonic Colors, Sonic The Hedgehog, Sonic & SEGA All-Stars Racing, Sonic made an appearance in Super Smash Bros. Brawl, but that's not an actual Sonic game.
2005
hkskjt5 sonic fgx 2 games is all rig
Rouge can be played as in... Sonic Adventure 2 Sonic Adventure 2 Battle Sonic Battle sonic riders That is all I can think of.
Mario games have a childlike storyline, the characters rarely talk and they are all basically the same. Mario games are very well made, on the positive side. Sonic games usually have a more mature storyline, the characters actually have voice actors and the games are always fresh. On the negative side, Sonic games are occasionally rushed in development, so there might be some glitches.
Super sonic is playable only during the ending sequence unlocked by beating all three of the main stories and is activated by the storyline.
probubly because of all the cream haters. she is in the Olympic winter games, but only as a refferi (...really, metal sonic and not cream WTF) in main storyline games. she is not in sonic 06, as she has no role in it. same for sonic unleashed. project needle mouse only has sonic, and NO ONE ELSE. if you want, you can try to get others to ask for cream to be included into more games (because the main reason she is not in them is because of the people that hate super nice, and cute people)
Free Sonic games can be found on a number of websites. Sonic Games, Daily Games, Games List, and One Online Games all feature free online Sonic games.
Sonic Rush, Sonic Rush Adventure and Sonic Chronicles.
Sonic rush, sonic rush advencher mario and sonic at the Olympic winter games, mario and sonic at the olympic games, sonic mega collection sonic chronicles the dark brotherhood, thats all i know.
super sonic is a golden sonic . sonic has to have all chaos emeralds in order to become super sonic.
Sonic Generations, Sonic All Stars Racing Unlimited
Sonic in all modern games is 15 years old.
Nether he is in super smash bros Vector the Crocodile (if this is the Vector you are referring to in the question) is part of the Sonic The Hedgehog franchise and has made an appearance in Sonic games such as Sonic Heroes and all three games of the Mario and Sonic at the Olympic Games series.
Here are the Sonic games for the Wii: Sonic and the Secret Rings, Mario and Sonic at the Olympic games, Sonic Unleashed, Sonic and the Black Knight, Sonic Riders Zero Gravity, Sonic Colors, Sonic The Hedgehog, Sonic & SEGA All-Stars Racing, Sonic made an appearance in Super Smash Bros. Brawl, but that's not an actual Sonic game.
Well if you're talking about Sonic The Hedgehog 2006, then all you need to do is play through Sonic's storyline until you battle Silver. Once you beat him, he is a playable character.