I may be five years late to the party here, but SEGA decided to celebrate Sonic's 20th anniversary with style, with classic and modern Sonic meeting in Sonic Generations!
I thought it might be an idea to put this up as a longplay just to see if there's any interest for this kind of thing, and it's not an overly long game so there's no harm in giving it a shot. This is a no-damage run where I get an S-Rank in every act, because... well, I might as well try to make it presentable.
This is the Xbox 360 version, for the record. Enjoy!
0:01:30 Green Hill Classic
0:05:41 Green Hill Modern
0:10:03 Chemical Plant Classic
0:12:23 Chemical Plant Modern
0:16:31 Sky Sanctuary Classic
0:19:55 Sky Sanctuary Modern
0:24:16 Green Hill Modern Mission - "Way Past Fast"
0:26:30 Chemical Plant Classic Mission - "Invincibility Challenge"
0:28:15 Sky Sanctuary Modern Mission - "Knuckles: Buried Treasure"
0:32:03 Rival Battle: Metal Sonic
0:36:17 Boss Battle: Death Egg Robot
0:41:18 Speed Highway Classic
0:44:35 Speed Highway Modern
0:47:58 City Escape Classic
0:51:02 City Escape Modern
0:55:04 Seaside Hill Classic
0:58:38 Seaside Hill Modern
1:03:49 Speed Highway Modern Mission - "Drill Baby Drill"
1:06:03 City Escape Modern Mission - "Cream: Helping Hand"
1:08:39 Seaside Hill Modern Mission - "Rouge: The Temptress"
1:11:41 Rival Battle: Shadow the Hedgehog
1:14:28 Boss Battle: Perfect Chaos
1:19:34 Crisis City Classic
1:24:15 Crisis City Modern
1:28:21 Rooftop Run Classic
1:33:19 Rooftop Run Modern
1:37:10 Planet Wisp Classic
1:43:56 Planet Wisp Modern
1:51:46 Crisis City Classic Mission - "Flame Shield Challenge"
1:53:40 Rooftop Run Modern Mission - "Rooftop Rail Grind"
1:56:00 Planet Wisp Modern Mission - "Action Master"
1:58:08 Rival Battle: Silver the Hedgehog
2:01:47 Boss Battle: Egg Dragoon
2:10:34 Time Eater Intro
2:14:31 Final Battle: Time Eater