"CONSTRUCT.TXT" is played by default. If it is named "EGGLAND1.MAP" (for "Eggerland for Windows 95"/"Revival! Eggerland") or "EGGLAND0.MAP" (for "Episode 0") instead, custom maps can be played by selecting "New Game". Playing a custom map as a .MAP file instead of a .TXT file allows progress to be saved at any time, which is mainly helpful for long and difficult maps. However, the game's original file must be changed to something else, such as "EGGLAND1.ORIGINAL.MAP", to not overwrite the file.