User blog comment:Milesprower2/Three Worlds Collide Again! Part 1: New Plants, New Friends/@comment-26531060-20130524090458/@comment-5792287-20130524120123

I'll start with Sonic games that I've played:

Sonic The Hedgehog, Sonic The Hedgehog 2, Sonic The Hedgehog 3, Sonic & Knuckles, Sonic Spinball, Sonic Drift (hate it, but played it), Sonic Labyrinth (same as Drift), Sonic Adventure, Sonic Adventure 2, Sonic Heroes, Sonic Riders, Shadow The Hedgehog, Sonic 06, Sonic Generations, Sonic Unleashed, Sonic 4 Ep 1, Sonic 4 Ep 2, Sonic Free Riders, Sonic 3D, Sonic R.

That's 20, and there are non-Sonic games too:

Plants vs. Zombies, Space Invaders by Activision (a better version of the original), Futurama the Game, The Simpsons Game, Simpsons Hit & Run, Family Guy Back to the Multiverse, Halo: Combat Evolved, Halo 2, Halo 3, Halo Reach, Halo 4.

30 games. I've played others too, but you asked me to name 30 games I've played, and I've done that.