Sonic Mega Collection and Sonic Gems Collection are two different games. If you're into ye olde Sonic games, then get both! Sonic Gems is £20 and you could probably pick up Mega Collection for very little now. I must say that Mega Collection is very fun. The best bit is multiplayer Sonic 3.

I'm getting Gems Collection for my bithday as well. Oh yeah, and I also own Sonic Adventures 1 and 2, and Sonic Heroes. In my opinion, the adventures are much better (about equal in my opinion) but Sonic Heroes is still well worth playing. Go Sonic!
So which sonic game should I buy
Mega Collection
Gem Collection
Adventures 1
Adventures 2
???
Please tell me then tomorrow I'll go buy one

I'd recommend Sonic Mega Collection, because it has better Sonic classics then Gems, and i hate Sonic in 3D lol
is it multi player too? And has it a longer than 20 hours gameplay?
Well the multi-player is very limited and if you're good at the Sonic Games it shouldn't even take 20 hours.
If you don't mind 3d Sonic Games, then Sonic Adventure 2 is the way to go in my opinion.
but if its multi player your after don't get sonic adventure 2 coz the multi player is shall we say? limited to the very least
Yeah, if you want something with good multi-player than none of the Sonic games will work. All Sonic games are more based for single player.
Lee-yoshi Wrote:Wow, those four games make a perfect collection as they are! 
Multiplayer games eh? Why not try 1080 Avalanche (Snowboarding) or F-Zero GX (Stupidly Fast Racing), or maybe even WWE Day of Reckoning/2 if you're into wrestling games
Of course there is Mario Kart: Double Dash!! which many other people have stated, or Mario Party for multiplayer fun 
I'd agree with it all, especially WWE DoR 2 like Lee-Yoshi said[if you're into wrestling]. I just bought mine today and its great.
I'd say between Mario Kart, Crystal Chronicals, Madden[ if you like football], Monopoly[If you like the board game and don't feel like dealing with the pieces, like me], Timesplitters 2 or Future Perfect, Metroid Prime 2[if you really like Samus], Mystic Heroes[Plays like Dynasty Warriors but hard to find these days], or even Pokemon, lol. I'm just trying to name a few of the multiplayer games in different genres.
Yeah, Sonic is awesome in one player, but the multiplayer is a real letdown. I suggest (same as other people) that you get TimeSplitters: Future Perfect or Mario Kart: Double Dash!!
Well I played all the multi player games you said, there aren't any other good multi games?
Is Super Monkey Ball 2 fun?