Metal Gear Acid is a turn-based tactical card game developed by Konami Computer Entertainment Japan, released in 2004 as the first Metal Gear title for the PlayStation Portable. The name "Acid" stands for "Active Command Intelligence Duel." A mobile adaptation was later published by Glu Mobile in 2008. Gameplay revolves around a card-based system in which players draw from a customizable deck to govern both movement and actions. Cards drawn from Metal Gear series lore — covering weapons, characters, and equipment — can be used as intended or spent solely to reposition a character on the map. A cost mechanic determines turn order: higher-cost actions delay the acting character's next turn relative to opponents. Certain cards can be equipped and enhanced by attaching compatible cards, while others are single-use and discarded after deployment. Deck size expands with progression. A wireless ad-hoc multiplayer mode called "Link Battle" lets two PSP systems compete in a stealth-oriented contest to collect diskettes while evading the rival player.
In 2016, a jumbo jet carrying Senator Hach, an important politician and likely future presidential candidate, is hijacked by terrorists. In exchange for the senator, the terrorists demand from the United States government Pythagoras, a research project being conducted in the Moloni Republic in southern Africa. In an effort to identify these terrorists, the government begins an investigation of Pythagoras. The Moloni government refuses to cooperate and work with the United States, saying that it doesn't want to interfere in its current affairs. In response, the US send in a covert special forces team to investigate, but the team is obliterated by armed resistance. With no other options and time running out, the US government calls Solid Snake to infiltrate the laboratory, discover the nature of Pythagoras, and rescue Senator Hach.
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