


Future Metroid games would include saving in all versions.
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Thus, the NES version of Metroid uses a password system. At the time, saving to a game cartridge was effectively impossible without the inclusion of an internal battery, a high-cost solution Nintendo opted not to use for Metroid in order to produce more copies of the battery-backed The Legend of Zelda, which Nintendo viewed as the stronger game with higher sales potential. The most notable difference between the two versions is the inclusion of game file saving in the Famicom Disk version, which came on a floppy disk that could be easily written to. Localization and hardware limitations meant that the NES and Famicom Disk versions have several differences. The original Metroid was first released on the Famicom Disk System in 1986 and on the NES a year later. 6.3 New Play Control! Metroid Prime 2: Dark Echoes.
