In this game's original Japanese version, there were three save files. However, the only time when players could save their games was when they played the Song of Time to warp back to the beginning of the three-day cycle. When the English version of Majora's Mask was being developed, Nintendo added an interrupt-save feature, which would not actually save the data permanently (as playing the Song of Time would), but instead kept the in-progress data in memory until the next time the file was opened. Due to space restrictions, however, this feature forced Nintendo to remove one of the save files for the English-language release, making it the first and perhaps last Zelda game to feature only two save files rather than the traditional three.