Where can I play Sonic the Hedgehog 2 for sega genesis?

Where can I play Sonic the Hedgehog 2 for sega genesis?
I want to play the sonic the hedgehog 2 for sega genesis for free online. I have tried many game sites and i am looking for just the link to play the game.

I am looking for the one where tails follows you around. it was made in 1992


also i bought this game for my phone and it only goes to level 5:( i really want to play the whole thing so if anybody knows of a good game site for cell phones not blackberrys or iPhones then tell me too im game.
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