I have collected only 6.
Sonic The Hedgehog - Awesome game, Still enjoyable, if you can be assed to continue playing it
Sonic The Hedgehog 2 - One of the few games i've yet to complete, sadly i always die on the final boss.
[You've guessed it...]
Sonic The Hedgehog 3 - Easily Completeable, more playability, but less levels due to the fact that the game was cut in two because it took up too much catridge space alone, hence why sonic & knuckles was released in the same year i believe.
Ristar - Awesome game, one of the best games sega ever made, i enjoy this so much, buy it if you like platformers.
Golden Axe - Nice arcade game, with some stylish graphics.
Streets Of Rage - Awesome fighter, and arcade styled game, with a somewhat refreshing story.
I do plan to eventually buy streets of rage 2, and maybe 3, likewise with golden axe.
And there are various other virtual console games i'm looking forward to purchasing, when i have money *sigh*