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Metal Gear Ac!d consists of two Gaiden Games that take place in a different timeline than the main Metal Gear and Metal Gear Solid series. Unlike the main games, these two are turn-based card/miniature-like strategy games, although stealth and pacifism are still rewarded.

The first game, Metal Gear Ac!d, follows Solid Snake, who in this timeline has been in retirement since an unspecified previous mission until 2016, and a new partner, Teliko. U.S. Senator Viggo Hach is being held hostage aboard a plane, and only Snake can infiltrate the terrorists' base and find out what they're really after. However, the mission may involve confronting a past he doesn't remember...

The second game, Metal Gear Ac!d 2, focuses on an amnesiac Snake blackmailed by an FBI agent into investigating a strange corporate base.

This game provides examples of the following tropes:

  • Absolute Cleavage: Take one look at Takiyama and Teliko...
  • Arbitrary Skepticism: Snake isn't convinced Alice is actually psychic, even though such powers exist in the Metal Gear universe. He turns out to be right... at least partially. Alice was really just familiar with the layout of the base, but there was some sort of reincarnation of children involved. It's complicated.
    • Snake, to Venus' dousing, for the same reasons. He's also a bit skeptical of the second-to-last Boss's psychic powers. Until he walks on the ceiling.
  • Awesome but Impractical: A rare for-the-villains version. Chiagdiel, a Viet-Cong psychic ninja with a grenade launcher, whenever he walks on the ceiling, is a stationary target and easy to whack with, say, a rifle. Or a good old fashioned handgun. Hitting him with even a pistol will cause him to fall off and take extra damage.
  • Big Bad Ensemble: Leone, William Flemming/Gary Murray Lena Arrow and Alice Hazel.
  • Big Lipped Alligator Moment: The entire second fight with Leone


  • Brainwashed and Crazy: Venus. For starters, she attempts to kill Snake nearing the end because Wiseman ordered her to. It is also heavily implied that she couldn't refuse his orders as he removed her free will.
    • Snake and the other test subjects were this, but gained amnesia. Venus was one of the more "successful" ones.
  • Clear My Name: Leone's last words, "It wasn't me," are to clear his name.
    • Snake also has to do this in Metal Gear Ac!d 2. Well, technically - Dalton's blackmailing him into investigating SaintLogic, and if he does so, he'll get pardoned and will be a legal immigrant to the US.
  • Continuity Nod: Nearly all of the card decks, for one. You can even shoot guns that were in the original Metal Gear games - in sprite form, no less.
    • On a side note, some weapons (like the PTRS/PTRD, RPK, et cetera) made their way into Metal Gear Solid Peace Walker. The XM8 and XM25 got into Metal Gear Solid 4 Guns of the Patriots.
    • Venus and Teliko are hidden characters in Portable Ops.
    • Kopplethorn is a name in Metal Gear Solid 2: Substance's wacky Snake Tale "External Gazer", where he made a VR machine... that's powered by destroying alternate universes. Before that, he was mentioned by Meiling in Ghost Babel (but was interrupted by Snake).
  • Defog of War: There are multiple cards dedicated to this, though they all have certain drawbacks, like having a high cost draw.
  • Discontinuity Nod: In Metal Gear Solid 3 Snake Eater, rations were used to replenish stamina, rather than to heal as in the other games. However, in the Ac!d games, since there is no stamina, rations heal again. The description for the "Ration" card in the second game says that in the old days, soldiers used to think that rations restored stamina.
  • The Dog Bites Back: After Vincent is defeated by Snake and Venus, he learns that Rodzinski is leaving the facility on his getaway chopper and leaving the security forces to take the blame. After a particularly big Kick the Dog moment from Rodzinski, Vincent orders his soldiers to shoot him down, with the soldiers obeying the command without hesitation, presumably agreeing with him about why they should do so.

 Security Forces: Major! We've located Mr. Rodzinski! He's about to leave in a chopper, sir.

Vince: Put him on.

Rodzinski: What do you want? Wait. Vince, is that you?

Vince: Mr. Rodzinski. What are you doing?

Rodzinski: I'm getting the hell off this island!

Vince: But what about Koppelthorn?

Rodzinski: You think I give a damn about that lunatic?! The ICC has decided to carry out their investigation! My deal with those goddamn politicians was worthless! After all the money and assets I invested in this, they abandoned me at the first sign of uncertainty! The ICC is sending an investigation team to the island next week. At this point, they won't let me go even if I get them the Lucinda File. The deal is off, and now I'm facing criminal charges. If I'm tried under the Serena national judicial system, I could be executed!

Vince: ... What are you going to do?

Rodzinski: Run like hell! What other options do I have? I can't set foot in this country ever again. ...I never believed this day would come.

Vince: So you're leaving this whole mess here with us?

Rodzinski: Spare me the sad story, Vince. You're the big boys. Take care of yourselves for once!

Vince: ...

Security Forces: Awaiting your orders, sir.

Vince: Shoot the bastard down.

Security Forces: Yes, sir.

  • Even Evil Has Standards: In the second game, Vince is disgusted by his employer's lack of honor trying to evac the site with its personnel left behind when it's clear there's no stopping Kopplethorn and actually orders his men to kill him by blowing his helicopter out of the sky. Before he dies, he requests that Snake and Venus let the rest of his men live.
    • In game, though, he often accidentally kills his own men via rocket launcher or thrown barrels.
  • Fog of War: Some levels are in "Search Mode", which functions as this for the player. Even when it's not in effect, though, when the guards aren't on alert, they basically have their own Fog of War.
  • Gaiden Game: These games don't have the "Solid" in their titles for a reason: They're totally not in continuity with the MGS titles, despite that they reference them constantly through the cards. Snake is still a legendary solider with a mysterious past, but there's no Liquid, no FOXHOUND, no Big Boss. This allows the creators to give Snake an entirely new mysterious past to mess with him.
  • Gameplay and Story Segregation: Varies. The first rendered cutscene in the first game shows Teliko in a mission, with her movement and actions controlled by the same cards and grid that the player uses to play, and Roger later tells Snake about the cards, referring to them as, well, cards. But later, cutscenes are more conventional, and in the second game the cards are just referred to as "techniques" that the amnesiac Snake must relearn, as a form of nanotechnological data packets that are released into his brain.
    • Lampshaded several times in the sequel - Dalton complains about the CARD system's explanations being confusing and jargon-filled when Wiseman rambles on about them, and while Lucy/Metal Gear gloats, Snake and Venus calmly discuss Metal Gear's "glitch" that allows you to see its drawn cards.
    • During the fight with Venus, you can kick her off the ledge if you're lucky, allowing you to bypass the entire battle. She's back up on the railing in the cutscene though.
  • Gotta Catch Em All: There are a lot of cards to collect... or buy. Since you only get three cards at a time upon a purchase and they're randomly determined, trying to get all of them is an exercise in utter frustration.
  • Jerkass: Venus to Doc Takiyama... even after Venus rescues Takiyama from arrest.
  • Jiggle Physics: Present in the second game, and very noticeable since everyone's jiggle physics are... activated every time a new scene is rendered. They are extremely wobbly.
    • Fun fact: Snake's web belt has the same boobie physics as Venus'.
  • Jigsaw Puzzle Plot: The first game manages to be somewhat more confusing than the main series. The second game is easy to follow (which is not to say it doesn't get a little weird).
  • Kudzu Plot: To a lesser degree than in the main series, but it does get complicated at times. Lampshaded in 2 - Dalton struggles to keep up.
  • Large Ham: The Kerotan who advertises new card packs.


  • Love Makes You Evil: Kopplethorn's entire reason for going batshit insane on his own facility. To some extent, Lucy's motherly drive for her ungodly mutants drives her to use Chaioth to make the world a better place for the test subjects.
  • Lucky Charms Title
  • Mirror Boss: The final boss of Metal Gear Ac!d 2 is Venus herself, who draws the exact same cards as you do in your deck, but at an increased rate. You're going to have to play very cleverly to gain an advantage.
    • Or, since she uses EXACTLY the same cards you do, fill your deck with movement and healing cards, position yourself towards the edge of the area facing the entrance next to the pit, get Venus right next to the edge, and punch-punch-kick her off for an easy victory.
  • No Fourth Wall

 Snake... er, Hans: Hey, come on! Don't change my name in the text box!

    • Snake and Venus calmly discussing the final boss's weakness as it rants on and on about her motivations.
  • Nostalgia Level: The Metal Gear KODOQUE/Pythagoras fight in the second game.
    • Somewhat played with in MGA2's Arena Mode: The levels are based on MGS1, MGS2, and MGS3, but aren't based off any one level. On the other hand, you can fight Liquid Snake, Revolver Ocelot, Vamp, Fortune, The End, The Boss, Venus and Teliko (The first and last can kill you in a single turn using a SOCOM which sometimes hits up to twenty times!). The enemy teams in arena mode always contain two people and are not randomly generated. Sometimes you'll get seemingly strange pairings (like two Telikos) but other times you get the standard pairings (e.g. Revolver Ocelot & Liquid Snake).
  • Old Save Bonus: If you have photo save files from Metal Gear Solid 3 Snake Eater: Subsistence, you can connect your PSP to your Play Station 2 and view the pictures in 3D using the "Solid Eye" viewer in Metal Gear Ac!d 2. Additionally, you can import a limited number of cards from the first game into your deck in the second game. Both Ac!d games also unlock characters in Metal Gear Solid Portable Ops.
  • Only Mostly Dead: Characters can take a lot of punishment, even being run over by trains, and still be revived on their own as long as there's another party member still alive.
    • Mooks, on the other hand...
  • Pacifist Run: Much, much harder, especially thanks to the range of tranq weapons, how plentiful lethal weapons are, and CQC's tendency to knock someone off a ledge... with lethal results. Still somewhat encouraged by Dalton, who will mention early on how many people you've killed so far and will note that you will be killed if you are caught, and Vince, who later on asks that Snake and Venus spare some of his soldiers, but beyond that, there's no Video Game Cruelty Punishment, aside from not getting as many bonus points or cards as you do with no kills.
  • Parrot Exposition: Mostly absent from both games, but lampshaded in the second game.

 Snake: Metal... Gear?

Dalton: Huh? Do you know anything about it?

Snake: No... I just felt like I should say that.

  • Private Military Contractors: SaintLogic Inc. uses mercenaries as guards and produces weaponry for war.
  • Psycho Prototype: All of the Test Subjects in the second game, fulfilling the role of Quirky Miniboss Squad. They include a giant cyborg ape who can shoot his arms at you (and regrow them!), a hypnotist dressed as a traditional Japanese... something... who likes to walk on the ceiling, and a man holding a giant fuel container which he drinks out of to breathe fire.
  • Riding the Bomb: In the ending for Ac!d 2, Snake ends up using the destroyed Metal Gear's missile launching ability to escape by cramming himself into a dummy warhead. It broke every single bone in his body - but he healed, thanks to his status as a super soldier.
  • Theme Naming: The names of the Test Subjects and the Metal Gear itself in Ac!d 2 all come from the Kabbalah.
  • Those Two Guys and that Girl: The pilots and Consuela, who accompanied Snake to the US before getting caught. They're reunited at the end, but are absent for most of the game (besides some "encouragement" by Dalton and Snake.)
  • Three Dimensional Episode: The second game can be played in 3D, and comes with a "Solid Eye" viewer (no, not the eyepatch from Metal Gear Solid 4 Guns of the Patriots, a box with separate eyeholes for each half of the screen). Also used for viewing pictures taken from MGS3 in 3D... usually, those of EVA.
  • Tomato in the Mirror: "Snake" from Acid 2 is actually a clone of the original, who died.
  • Wasted Song: The "Metal Gear Solid Main Theme" is heard all-too-briefly during an advertisement for the MGS1 Pack in Ac!d 2. The theme has been absent from Metal Gear games starting with Portable Ops because of accusations of plagiarism. As a result, this usage in the ad is the only appearance of the original version (by TAPPY) within any of the actual games (not counting soundtracks), the only appearance of the theme in any of the PSP Metal Gear games, and its final appearance in any Metal Gear game aside from Updated Rereleases.