One of my favorite games of the past was Jet Set Radio. Debuting on the Sega Dreamcast, the game was about a small gang of Japanese teens that used motorized skates and graffiti to challenge a corrupt corporation on the streets of Japan. You can see a small trailer of it here. Jet Set Radio even holds up today, despite it being close to ten years old.
I now have this game on my phone.
No, seriously, Sega released a direct port of it, 3-D and all, for android phones. A game that I cheerfully spent $50 for is now $5, and I have it along with my other favorite DC game, Chu Chu Rocket . A phone can now run the most graphically demanding games of ten years ago. Amazing.