Radiant Silvergun (Saturn)

Cross-Series (R-Type): The boss of 3-C is based on the ship from R-Type. It has a fat single shot that it needs to charge. It also has the R-Type II style wave charge shot. It has a satellite orb in front of it as a shield (reference to the force). It fires little missiles. And it has the three power ups that you can get in R-Type: Lasers that bounce off walls at 45 degrees, attacks that go along the walls, and a straightfoward round shot. (Credit: Crawl and 1000)
Status: TRUE: Verified by FO. There are too many similarities for it to be a coincidence.

Cross-Series (Final Fantasy Tactics): One of the pieces of music from this game is taken from Final Fantasy Tactics, the "2C thru E" theme. They both have the same composer (Hitoshi Sakimoto). (Credit: Crawl and 1000)
Status: TRUE: Verified by FO.

Rad Mobile (Arcade)

Cross-Series (Sonic the Hedgehog): Sonic hangs from the mirror while you race. (Credit: Michael Morrissette)
Status: Unverified

Raiders of the Lost Ark (Atari 2600)

Cross-Series (Yars Revenge): Walk off the Flying Saucer Mesa and drop the Chai. The Yar from Yars Revenge will appear.
Status: TRUE: Verified by FO.

Programmers: Howard Scott Warshaw hid his initials in this game, too. I think you have to get the Yar to appear and then beat the game. (Credit: Kairobi King)
Status: TRUE: Verified by FO.

Rampart (FC)

Cross-Series (Wai Wai World): The Famicom version is different from the NES version because it was made by Konami. In the main menu for the Famicom version, the icon you use to select options is Konami Man's head. (Credit: Arnold & Dire 51)
Status: TRUE: Verified by the OPCFG.

Ratchet and Clank: Going Commando (PS2)

Cross-Series (Jak & Daxter): A large portrait of fellow platformers Jak & Daxter can be found in Clank's apartment. (Credit: SlyDante)
Status: Unverified

Ready 2 Rumble Boxing Round 2 (PS2)

Famous Person (Bill Clinton): Bill Clinton is one of the hidden playable boxers. He's called "Mr. President". (Credit: Ragnorak-X)
Status: Unverified

Famous Person (Various): Michael Jackson, Shaquille O' Neal, and Hilary Clinton also make appearances as hidden characters. (Credit: Rick L)
Status: Unverified

Resident Evil 2 (PS1)

Character Cameo: Brad Vickers, the helicopter pilot from the first game, appears in RE2 as a zombie if certain requirements are met. (Credit: Ace Whatever)
Status: Unverified

Return Fire (PS1)

Music/Movie (Various): Return Fire uses classical music for a lot of its tracks, including, "Flight of the Valkyries", "Overture of 1812", and "The William Tell Overture". Not only are these cameos in themselves, but flying in a helicopter with "Ride of the Valkyries" playing is taken from a scene in Apocalypse Now. (Credit: Deathspork)
Status: Unverified

Revelations: The Demon Slayer (GB)

Mythology (Biblical): The Gaia Masters' names all come from biblical sources. Raphael and Michael were angels. Baal and Mephist (Mephisto?) were false gods, and Lucifer is a fallen angel also known as Satan. (Credit: ShadOtterdan)
Status: TRUE: Verified by FO. Numerous sources confirm it.

Revenge of Shinobi, The (Genesis)

Movie (Rambo): The bad guys with flamethrowers are Rambo. (Credit: Andy Thorley)
Status: Unverified

Movie (The Terminator): The Terminator is one of the bosses, and he slowly turns green as you attack him, like the Incredible Hulk. (Credit: Andy Thorley)
Status: Unverified

TV Shows (Spider-Man/Batman): Spider-Man is one of the bosses, and after you beat him he will, for some reason, turn into Batman. Batman was taken out of the PAL release and replaced with Goliath from Gargoyles. (Credit: Andy Thorley)
Status: Unverified

Rez (DC/PS2)

Cross-Series (Space Channel 5): There's an unlockable morolian form, a bad guy from Space Channel 5. (Credit: Travis Fahs)
Status: Unverified

Rhapsody: A Musical Adventure (PS1)

Cross-Series (Tail Concerto): In the town of RedHot, there's a sign in the town's General Store that says, "TAIL CONCERTO", which is another PS1 game made by the same company that produced Rhapsody. Also, Miss Myao's kittens look exactly like the kittens in Tail Concerto.
Status: TRUE: Verified by FO. (Screenshot) proves it.

Cross-Series (Thousand Arms): In the town of Oasis there's a sign that says something like, "THOUSAN...AR...I can't read it, the sign is too dirty!" I'm sure that it's supposed to say THOUSAND ARMS, another PS1 game made by Atlus.
Status: TRUE: Verified by FO. (Screenshot) proves it.

Programmers: Some treasure chests sing, "Atlus USA!" when you try to open them.
Status: TRUE: Verified by FO.

Comics (Spawn): The puppet you get through the mail-order club, Dark Knight, is clearly a rip-off of Todd McFarlane's Spawn. He's like a super-deformed version of Spawn. (Screenshot)
Status: TRUE: If the similar looks aren't enough evidence that someone who worked on this game was a fan of Spawn, the comic book itself is spoofed when Cornet looks at a bookshelf and says, "Look at all the comic books! They even have SPOON #!" That MUST be a spoof of Spawn. Otherwise, it doesn't make any sense. (Screenshot)

Ridge Racer (PS1)

Cross-Series (Galaxian): You play a mini version of Galaxian while the game is loading (kill all the Galaxians to unlock hidden cars!) (Credit: Dire 51)
Status: Unverified

Programmers: The hall-of-fame message spells out RIDGE RACER PSX NAMCO. (Credit: Michael Morissette)
Status: Unverified

Ridge Racer 5 (PS1)

Cross-Series (Pac-Man): One of the music tracks that plays during the race is a remix of the Pac-Man theme. (Credit: PenguinMan26)
Status: Unverified

Ridge Racer 64 (N64)

TV Shows (Transformers): One of the trucks on the side of the road is based on the famous Autobot Leader Optimus Prime from Transformers. There's also, supposedly, a reference to the Transformers movie and Peter Cullen, the voice actor of Optimus Prime, in a movie theater on one of the courses.
Status: TRUE: Several sources have confirmed this is true, including the (ZMFTS Homepage).

Ridge Racer Revolution (PS1)

Cross-Series (Galaga): Same as Ridge Racer, but this time it's a mini version of Galaga '88. (Credit: Dire 51)
Status: Unverified

Ridge Racer Type 4 (PS1)

Cross-Series (Klonoa: Door to Phantomile): The track "Phantomile" is based on Klonoa: Door to Phantomile. (Credit: Michael Morissette)
Status: Unverified

Cross-Series (Pac-Man/Dig Dug): There are Pac-Man and Pooka (of Dig-Dug fame) statues near the finish line in the "Phantomile" track. (Credit: Michael Morissette)
Status: Unverified

Miscellaneous: The track "Shooting Hoops" is most likely an NBA reference (explains that the track is in Los Angeles) and the track looks like a basketball hoop. (Credit: Michael Morissette)
Status: Unverified

Cross-Series (Various): The default decals are all based on Namco games (ex. Bosconian). Many of the trophies in this game are based upon many of Namco's earlier games (ex. Pac-Man, Klonoa, Mappy). (Credit: Michael Morissette)
Status: Unverified

Cross-Series/Music (Various): On the beginning of the "Helter Skelter / Out of Blue", there's a screen that has 3 Namco characters and the bottom blinks "Movin' On". One of them is Pooka from Dig Dug, another is Rally-X. FO's Note: "Helter Skelter" is a Beatles song, and "Out of the Blue" is an Electric Light Orchestra album title. Someone must like classic rock! (Credit: Michael Morissette)
Status: Unverified

Cross-Series (Phozon): In the "Edge of the Earth" level, at the end of the first sharp turn, there is a skyscraper with PHOZON in neon letters, a reference to one of Namco's earlier games, Phozon. (Credit: Michael Morissette)
Status: Unverified

Programmers: There's a Namco blimp from Namco Museum Vol. 1 (which is from the "Pole Position" room) in the "Phantomile" stage. (Credit: Michael Morissette)
Status: Unverified

Specific Reference: There are Ridge Racer Type 4 and Rage Racer billboards in this game. (Credit: Michael Morissette)
Status: Unverified

Cross-Series (Galaxian): There still is a Galaxian clone in this version of Ridge Racer, and you still unlock the 8 cars from winning. (Credit: Michael Morissette)
Status: Unverified

Ristar (Genesis)

Movie (The Terminator): When you beat the Kaiser and Ristar flies into space, you hear him say "Hasta la vista, baby" which is a line from Terminator 2: Judgment Day. (Credit: Andy Thorley)
Status: Unverified

Rival Schools (PS1)

Cross-Series (Street Fighter Alpha): Sakura from Street Fighter Alpha is a playable character. (Credit: MJB817)
Status: TRUE: Verified by FO. Numerous sources confirm it.

River City Ransom (NES)

Cross-Series (Double Dragon): The "Dragon Twins" bosses are a Double Dragon reference, and their theme music is the title music from Double Dragon.
Status: TRUE: Verified by FO.

Road Fighter (FC)

Cross-Series (Wai Wai World): If you get through most of a course without crashing once, Konami Man will fly by on the left side of the screen and award you bonus points. (Credit: Arnold & Dire 51)
Status: TRUE: Verified by the OPCFG. .

Robopon 2 (GBA)

TV Shows (Various): The Robopon "Gundarn" is a reference to the Gundam anime. The Robopon Rider1 and RiderV are very similar to the Japanese superhero "Masked Rider." The Robopon Mock V is a reference to Speed Racer's Car, the "Mach 5". (Credit: MJB817)
Status: Unverified

Cross-Series (Mega Man): The Robopons Protopon and Soul are references to the Mega Man series. Soul is very similar to Mega Man, and his description even reads "Fight for Everlasting Peace!" (Credit: MJB817)
Status: Unverified

TV Shows (The Simpsons/Pokemon): The Robopon Train's description reads "Choo-Choo Choose this Robopon!", which is either a reference to the Simpsons episode where Lisa gives Ralph a card that says "I Choo-Choo Choose you!", or a Pokemon reference. (Credit: MJB817)
Status: Unverified

TV Shows (Knight Rider): The Robopon NitBoat's description reads: "A wise-talking, crime-solving boat." This is a reference to K.I.T.T. from the show "Knight Rider", about a talking, crime solving car. (Credit: MJB817)
Status: Unverified

Famous Person (Bill Gates): There is a man named Gate who owns Macro computers and has a robot dog named X-Dog. This is a reference to Bill Gates, Microsoft, and Xbox. (Credit: MJB817)
Status: Unverified

Real Place (Mt. Fuji): The Robopon Fujipon is a robotic version of Japan's Famous Mt. Fuji. (Credit: MJB817)
Status: Unverified

Cross-Series (Bemani): The Robopon B-Mani is a reference to the popular game series. (Credit: MJB817)
Status: Unverified

Anime/Famous Person (Cowboy Bebop/Mick Jagger): At the area called Pond Garden you fight Jett and Spikey who are references to the anime "Cowboy Bebop." When you defeat Spikey, he even says "See you, Robopon boy!", which is similar to the line, "See you space cowboy!", that is used at the end of many episodes. In this same area, you also fight a man named Jagg, who is a reference to Mick Jagger. (Credit: MJB817)
Status: Unverified

Famous Person (Musashi/Kojiro): The Robopons Musashi and Kojiro are references to the samurais of Japanese legend. (Credit: MJB817)
Status: Unverified

Anime (Trigun): The character Nick D. is a reference to Nicholas D. Wolfwood from the anime Trigun. They both have very similar names and they both run orphanages. (Credit: MJB817)
Status: Unverified

RoboTrek (SNES)

Cross-Series (ActRaiser 2/Illusion of Gaia): The computer in the hero's house gives you an advertisement for ActRaiser 2 and Illusion of Gaia when you turn it on.
Status: TRUE: (Screenshot) proves it.

Console (SNES): The computer used to make robots is a giant Super Famicom controller.
Status: TRUE: (Screenshot) proves it.

Cross-Series (Castlevania): The Count has a lot of names, and one of them is "Belmont". It might be a Castlevania homage, though Robotrek was not made by Konami.
Status: TRUE: Verified by FO.

Character Cameo: Turbo the dog, from Soul Blazer, makes yet another appearance in an Enix game. He's located in Rococo town next to the Mayor's office. (Credit: Bomberguy221)
Status: TRUE: (Screenshot) proves it.

Programmers: Many Enix games have the "Phoenix" as the ultimate power. In Robotrek, the strongest sword shoots out a Phoenix. (See under ActRaiser 2 for more info.)
Status: TRUE: Verified by FO.

Programmers: The planet "Quintenix" is an obvious reference to Quintet and Enix, the developers of the game.
Status: TRUE: (Screenshot) proves it.

Famous Person (Albert Einstein): Dr. Einst is named after and looks like Albert Einstein.
Status: TRUE: (Screenshot) proves it.

Cross-Series (Soul Blazer): The cats in RoboTrek look just like the cats in Soul Blazer.
Status: TRUE: Verified by FO.

Cross-Series (Soul Blazer/Illusion of Gaia): There are some strange similarities between Robotrek, Soul Blazer, and Illusion of Gaia. Both Robotrek and Blazer have a theme about inventors and tools, and you can talk to animals in both. The final area of all three games (RoboTrek, Soul Blazer and Illusion of Gaia) is against an outer space "warping" background. And all three games have the same exact text font.
Status: TRUE: Verified by FO.

Cross-Series (Illusion of Gaia): In the very end of RoboTrek, after you beat the game, there's a cut scene of Kotetsu's ship escaping from the fortress. The fortress, seen in the background before it explodes, looks alot like the Tower of Babel from Illusion of Gaia. Kotetsu's ship also has the American Super NES controller buttons on the side of the front end.
Status: TRUE: (Screenshot) proves it. (Note: I had earlier said that the ship looked somewhat like the one from Aliens, but now that I look at it again, I think the resemblance was coincidental because Kotetsu's ship appears to be shaped like a sword.)

Rocket Knight Adventures (Genesis)

Cross-Series (Gradius): The "Pulsating Plasma Blaster" on stage 5 is a take on the Gradius boss. (Credit: Deathspork)
Status: TRUE: Verified by FO.

Cross-Series (Goemon): The platforms on stage 2 that are behind and in front of the waterfall were also featured in the Konami SNES game, Legend of the Mystical Ninja. (Credit: Deathspork)
Status: Unverified

Cross-Series (Bucky O'Hare): The stage 6 boss is a take on the next-to-last boss of Bucky O'Hare. (Credit: Deathspork)
Status: Unverified

Rocket: Robot on Wheels (N64)

Real Place (Coney Island): The first area is called "Clowney Island", which is a take on "Coney Island". (Credit: Codie Martin)
Status: Unverified

Real Place (Mt. Rushmore): In the mini game "Feed The Presidents", you're throwing the apples into the mouths of nutcracker versions of the presidents' faces on Mount Rushmore. (Credit: Codie Martin)
Status: Unverified

Roland in the Caves (CPC464/6128)

Music (La Cucaracha): The theme tune is "La Cucaracha". (Credit: Andy Thorley)
Status: Unverified

Roland on the Ropes (CPC464/6128)

Music (High Noon): The theme tune is "Do Not Forsake Me, Oh My Darling" from the film "High Noon". (Credit: Andy Thorley)
Status: Unverified

R-Type (Multiplatform)

Movie (Alien): The first boss (the Krell aka Double Keradops aka Gladiator aka Doppelganger, etc.) resembles the alien from the Alien movies.
Status: TRUE: See (Oddities 22) for picture comparisons.

R-Type 2 (Multiplatform)

Movie (Alien): The Alien-esque Krell is back, but now its covered in armor and called the "Subatom" or "Zabtom". You can blow away its mask to reveal its face, though.
Status: TRUE: (Screenshot) proves it.

Programmers: The tiles in the background of stage 4 of R-Type 2 read "IREM". (Credit: Crawl and 1000)
Status: TRUE: Verified by FO.

R-Type 3 (SNES/GBA)

Movie (Alien): And yet another appearance of the Alien-inspired Krell as a boss! He's even got a chestburster.
Status: TRUE: (Screenshot) proves it.

R-Type Delta (PS1)

Cross-Series (Image Fight): The Level 4 Boss has the same type of semi-circle laser beams that the Level 1 Boss of Image Fight has. (Credit: Crawl and 1000)
Status: TRUE: Verified by FO.

Movie (Alien): The Alien-like Krell is back as a boss in this game, too. (Credit: Crawl and 1000)
Status: TRUE: (Screenshot) proves it.
FO's Note: Please note that the Krell bosses were included multiple times because they are an Alien reference, not because they are character cameos or intra-series cameos. Stop trying to refute them! CASE CLOSED!

R-Type Final (PS2)

Cross-Series (X-Multiply): The RX-12 ship ("Cross the Rubicon") has a powerup similar to that of the ship in X-Multiply. (Credit: Crawl and 1000)
Status: TRUE: Verified by FO.

Cross-Series (Various): Some of the unlockable artwork in R-Type Final is based on stuff from other games, such as Gallop and Image Fight 2. (Credit: Crawl and 1000)
Status: TRUE: Verified by FO.

Rygar: The Legendary Adventure (PS2)

Music: The music in most of the Necromandio Cave comes from the Gran Mountains music in Rygar for the NES. (Credit: ShadOtterdan)
Status: Unverified

Specific Reference: The pedestals that you move to unlock barriers come from the arcade version of Rygar. (Credit: ShadOtterdan)
Status: Unverified