Wreck-It Ralph had at least a hundred references scattered throughout the entire movie, so here’s my go at naming all of the ones I saw firsthand:
References:
Sonic the Hedgehog (Sonic)
Doctor Eggman (Sonic)
Tails “Miles” Prower (Sonic)
Chemical Plant Zone (Sonic) (Ridiculously awesome credits opening)
Angel Island Robotnik Boss (Sonic)
Q*bert
PacMan
Orange PacMan ghost
Frogger
Dig Dug
Portal (Vanellope calls Ralph “grumpy GLaDOS” which is pretty great)
Subzero (Mortal Kombat)
Shuma-Gorath (Capcom)
Mario (Felix mentions his name at a party)
Mega Mushroom (Mario Bros.)
Bowser (Mario Bros.)
Star Wars
Teenage Mutant Ninja Turtles
Metal Gear Solid (the cheat code from the original game is used in-movie)
Exclamation Point (MGS)
Mad Hatter (Alice in Wonderland)
Subway (That sandwich chain)
Mentos (not product placement, but essential to the story)
Zombie (House of the Dead?)
Zangief (Street Fighter)
M. Bison (Street Fighter)
Ryu (Street Fighter)
Ken (Street Fighter)
Tapper
Halo/Tron (Not directly references but inferred in the game “Hero’s Duty”)
Lara Croft (name mentioned)
Skrillex
Needless to say, the movie was awesome (if I haven’t already convinced you in my two other Wreck-It Ralph posts).