Merry Gear Solid, in which you play as Saint Nick, codenamed "Solid Santa," during his mission to sneak into 14015 Hideo Drive to deliver presents. At the end, he is killed by Solid Snake, mistaking him for "Big Beard."
Bilingual Bonus: The "Bigotes Perfectos" project mentioned in the first game, and the store "Les Enfants Clotildes" in the second.
Clap Your Hands If You Believe: Invoked by Otacon to power some of the items. Used fairly disturbingly when explaining why the Missiletoe Launcher (missiles with giant lips on the end) doesn't kill the kids.
Otacon: "Tell you what. Let's call it a... Missiletoe Launcher!" Snake: "Missiletoe Launcher?!" Otacon: "Yeah! It's just like the Nikita but it fires... hmmm... Let's see... Let's say it fires a missile with a pair of lips on it... A Kissile!" Snake: "Otacon, you can't just—!" Otacon: "That's right! And smooching a kid with the Kissile will overwhelm them... with love!" (explains how to use it) Snake: "Kissiles?! Missiletoe Launcher?! This is ridiculous! Why should I believe a single thing you've said—" Otacon: "Well, because if you don't... ...You'll end up blowing up a lot of child—" Snake: "Alright! Alright! I believe you!"
All of 2 is one big reference to the original Metal Gear 2; the TADPOLE ambush on the elevator was actually a boss fight in the original game, and all of the backtracking plays just like the original.
Fission Mailed: In a part where Otacon thinks he can't reach you, he begins to yell "Snake? Snake?! SNAAAAAA—" until Snake interrupts.
The Hero Dies: Snake kills Santa at the end of the first game, mistaking him for Big Boss' twin brother.
Hey, It's That Voice!: In Name Only and in-universe, but in the second game, "Santa's Little Helper" sounds exactly like Liquid, in a parody of Master Miller from the first game... until it turns out that it was Solid Santa all along.
It Runs on Nonsensoleum: A lot of your gear has really screwy explanations for why they work, like the gift box that you can use to hide in (the kids you're hiding from will ignore it because "it's full of bombs") or the "See's Candy Cane" that lets you see invisible laser tripwires, or the aforementioned Missiletoe Launcher.
No Fourth Wall: Frequently parodied, and in one scene doubly subverted:
Otacon: "Snake, do you know what it means to 'break the fourth wall'?" Snake: "I think I remember you telling me about this... It had something to do with that wall in Shadow Moses that sounded a bit difference when I tapped on it... Sounded a bit more... hollow... That's when I broke the fourth wall... ...With some plastic explosives! I'm pretty sure Revolver Ocelot was just a few rooms further..." Snake: "... But why are we talking aboutMetal Gear Solid 1?" Otacon: "What?! That's not it at ALL, Snake!"
Recording: "Six buffets. More than enough to fill anything that moves!"
Nearly all of the weapons, including the "Holid Eye" and "Nova Cane."
The soundtrack titles, including the remix of "Encounter", "He Sees You When You're Sneaking."
Puzzle Boss: Both the milkman and the postman in the second game. To defeat the milkman, you have to set your computer clock ahead a couple of weeks, and to defeat the postman, you have to drag a file in the game directory onto the window.
Retraux: The graphics and overall style are roughly SNES-level, except for the voice acting.
Judging by the trailer for Merry Gear Solid 3, the series has moved up a bit to parody PS1-era graphics with Metal Gear Solid 4's free camera system.
Sequel Hook: At the end of Merry Gear Solid 2, a mysterious group called the "Ha He Ho Ho Ho" has apparently taken possession of the Merry Gear.
Stealth Pun: The "Holid Eye" gadget works by filtering out the "sad blues and greens" of Christmasses past to (somehow) grant you infrared vision - Otacon all but says "rose-tinted glasses".
Sure, Let's Go with That: How most of the items work. Otacon makes up some reason why something would work the way it does; for example, the toast can be used to un-jam the radar because the mold on the toast absorbs jam.
Talking to Himself: As all the voice work in the first game was done by a single person (except for the naughty children, who were voiced by the main programmer of the game), this was inevitable. Avoided in the second game due to the addition of five more voice actors, and though he voices a lot of characters once more, they never interact.