世界樹の迷宮
"Etrian Odyssey" requires that players maintain their own map by annotating (with the stylus) a small map displayed on the DS's touchscreen. The player is free to map accurately or haphazardly. However, the player cannot draw their own symbols, and must instead use the game's limited set of pre-designed symbols. The game also limits the number of symbols that can be used for each level map.