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A Game Card is a proprietary format of ROM cartridge used for the Nintendo DS, Nintendo DSi, Nintendo 3DS, New Nintendo 3DS, and the Nintendo Switch; the name comes from the fact that the cartridges are based on the Secure Digital Card format, resulting in a small, flat shape reminiscent of a playing card. Game cards serve as a successor to the larger Game Paks utilized in the Game Boy line, the NES, SNES, and N64. Nintendo DS game cards use the serial code prefix "NTR" (referring to the Nintendo DS's codename "Nitro") while 3DS game cards use the serial code prefix "LNA" on the game label and "CTR" on the back of the cartridge. Nintendo game cards are manufactured by the Taiwanese company Macronix.
Game cards are thin and square shaped, with 3DS game cards additionally featuring a small square to the right of the game label to prevent them from being inserted into original DS systems (though removing the tab and inserting one into the DS systems reveal that the system will not read the 3DS game cards regardless). The Nintendo Switch's game cards, meanwhile, are smaller and more rectangular shaped (the base is approximately 23 mm by 34 mm, making it slightly smaller than an SD Card), with proportionally longer pin connectors. Game cards are additionally color-coded based on which system they're designed for: DS game cards are dark gray, DSi game cards are white, 3DS game cards are light gray, and Switch game cards are black. While most game cards don't come in unique-color variations, those for Personal Trainer: Walking, Pokemon HeartGold and SoulSilver, Pokemon Black and White, and Pokémon Black and White 2 are black with a built-in infrared sensor.
The Nintendo 3DS and New 3DS are backwards-compatible with most DS & DSi game cards, but the latter two systems are incapable of running 3DS/New 3DS game cards. Additionally, DSi game cards cannot be run on the original DS and DS Lite due to them taking advantage of DSi features that the previous two DS models lack. While they can read the games, they cannot be played on them. For the same reason, the original 3DS/2DS models cannot run game cards designed specifically for the New 3DS/2DS models. The Nintendo Switch is only compatible with game cards designed specifically for the system, and so far, no other consoles can play them.
Curiously, the Nintendo Switch's game cards are coated in denatonium benzoate, a non-toxic chemical known for being the most bitter-tasting chemical compound in the world. According to Nintendo, the purpose of this chemical coating is to deter young children from ingesting and subsequently choking on the game cards. The discovery of the Switch game cards' bitter taste ironically led to numerous people tasting the denatonium benzoate for themselves, with varying results.
Despite ROM cartridges having fallen out of fashion for home consoles as a result of the Sony PlayStation's success over the N64, game cards have continuously found success with Nintendo handhelds as a result of their faster loading times (which is especially advantageous due to how handheld games are typically played in short intervals), near-immunity to counterfeiting, and reduced system manufacturing costs (optical discs require an optical drive consisting of a spindle and a laser in order to be read, which are more expensive due to the use of moving and/or fragile parts that renders them highly liable to break down; cartridges can simply be read with connector pins attached to the motherboard).
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