   is a turn-based collectible card video game developed by konami computer entertainment japan for the psp handheld game console. the game was first unveiled at e3 in may 2004, and was released in japan on december 16, 2004, in north america on march 22, 2005, and in europe on september 1, 2005. it was the first game in the metal gear series for the psp. acid focuses on turn-based tactics, using a trading card-based system to control the main character's movements and actions. acid in the name stands for "active command intelligence duel". the cards are not truly collectible, as the game is complete with a single purchase. however, the game does feature deck design and deck optimization elements. the game allows for multiplayer gameplay by wired connections of two psps. a java me version for mobile phones was released by glu mobile in  titled metal gear acid mobile. == gameplay == before each round, the player can customize the deck of cards used by the main characters. the majority of the cards are based upon elements spanning the entire metal gear series, such as weaponry, characters, and even the metal gear itself. when the game is started, the player's hand can consist of a maximum of six cards. the maximum number of cards in a deck increases with overall progress. in action mode, the player can choose to use the cards as they are intended or use them to move the character. most cards only allow the player to move three spaces, while certain cards let the player move up to six or higher. cost is an important factor in game play and can be summed up as the weight of the player's action. with some exceptions, all cards have a cost attached to them and when used this cost transfers to the player. cost varies radically from ca
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