Buying new game which.....

[pink]

Well there are three Sonic games. Sonic Adventure, Sonic Adventure 2 and Sonic Heros. Sonic Adventure 2 is the best one in my opinion. It's basically a game with fast paced action stages trying to zoom through, blast through, or find your way through the stages. There are 3 kinds of stages:

High-Speed Stage (Sonic and Shadow)
Mass Destruction Stage (Tails and Eggman)
Emerald Hunt Stage (Knuckles and Rouge)

The game will last you awhile because even after finishing the story there are 4 more missions for each stage and you have to A Rank them all in order to unlock a bonus stage and some extra goodies.

Sonic Adventure is similar, but there are only three missions for each stage making it generally shorter. Plus it is slower paced... and includes some annoying stage types. This game has 6 stage types:

High-Speed Stage (Sonic)
Race Stage (Tails)
Emerald Hunt Stage (Knuckles)
Fishing Stage (Big) <-- I hate those SO much...
Escape the Robot Stage (Amy) <-- Kinda like Sonic stages at 1/2 speed
Mass Destruction Stage (E102-Gamma)

Both the above games have the Chao Garden to deal with, but that's a whole different topic and can be finished with some patience.

The last game is Sonic Heros. It's good in its own way, but the gameplay is altered moderately. The game has 4 teams which gives you 4 different stage types:

Easy, short-length Stages (Team Rose) <-- This team will annoy you...
Medium length and difficulty Stages (Team Sonic)
Long and difficult Stages (Team Dark)
Quest Stages (Team Chaotix) <-- These can be weird sometimes.

Unfortunately all 4 teams play in the same stages unlike in the previous two games. The stages are all fairly fast paced except for a select few Team Chaotix quests, but the 3 people at once form of gameplay can make things awkward. One big bonus about this game is that there is no Chao Garden, but there is only 1 extra mission for each stage. The extra missions are always the same:

Collect 200 Rings (Team Rose)
Beat the Time Limit (Team Sonic) <-- Always my favourite
Destroy 100 Enemies (Team Dark)
Harder version of the Quest (Team Chaotix)

You have to get all A Ranks in order to unlock one last mode in this game, so you'll still have a fair bit of work to do. The game took me around 23 hours to beat, so it still isn't all that long.
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Well that's my speech on the Sonic games. If you need any more info on something more specific just ask. I had some time to waste so this speech did the trick.