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- In the dungeon, _ is an altar
- _ is an iron chain
- If set in Options, you can press _ to travel to a map location. You are presented with a prompt that allows you to move a cursor to the square you want to travel to and you are then moved as part of a shortest-path algorithm to that location. The algorithm fails when there are known traps in the way, instead causing you to travel in a straight line to the nearest wall near the trap. You can also specify a dungeon feature (i.e. > for the downstair) and it will cycle through all available and visible targets. This is useful on levels where there are two or more choices (upstairs to Sokoban, multiple sinks, etc.).