1) Kung Fu NES
2) Altered Beast Genesis
3) Golden Axe Genesis
4) Golden Axe GBA
5) Golden Axe Dreamcast
6) Golden Axe PS2
7) Golden Axe Sega CD
Golden Axe 360
9) Ninja Gaiden xbox
10) Ninja Gaiden NES
11) Cool Spot Genesis
12) The Duel Genesis
13) Pit Fighter Genesis
14) Hard Drvin' Genesis
15) Death Duel Genesis
16) Sonic The Hedgehog Genesis
17) Mutant League Football Genesis
18) TMNT Hyperstone Heist Genesis
19) Streets of Rage Sega CD
20) Streets of Rage 2 Genesis
21) Golden Axe 2 Genesis
22) Sewer Shark Sega CD
23) Chiki Chiki Boys Genesis
24) Sonic the Hedgehog 2 Genesis
25) Mega Man 2 NES
26) Mike Tyson's Punch-Out!! NES *new*
27) TMNT Fall of the Footclan Gameboy *new*
28) TMNT Something Sewers Gameboy *new*
By decision

Like jumping the poll in SMB, I've heard people say they've ko'd Tyson, but I've never seen it done.
The second TMNT installment for the Gameboy is so-so at best, but Fall of the Footclan is a joy to play. It's easy, but that is part of the charm of the game. It's also a game I frequently played during classes in middle school if a teacher was phoning it in.
I'll never forget (well, most prepubescent boys in my six grade class will also never forget) Miss. Black (who was white). She was a total knock out, fresh out of college, and on Fridays we would have at least one hour of "chill out time".
I'm snitching a bit, as she made us promise not to tell anyone about "chill out time", but I'm certain she wouldn't mind seeing as how long ago that was. I'd always have my Gameboy with me on Fridays, usually playing TMNT, Mario Land, or Ducktales. When it was getting close to 3pm she'd play a tape (lots of Milli Vanilli, Bon Jovi, and other terrible stuff) and let us do whatever we'd like as long as we didn't bother her.
She also wore a lot of v-necks. God bless her.