Posted May 23, 2016
JamesBond007: Nope, certain rooms cannot be reached. This map (based on the PS1 version) shows the unreachable rooms (green). Shaft's room is an exception, however there is no way to permanently record it on the map.
Wouldn't it be possible to record the room by going out-of-bounds in another room (for example, by using Double Heart Refresh) and then reaching that spot in the out-of-bounds area? (Failing that, there's always save corruption, and if you can't find a way to record that spot, there's arbitrary code execution, with which everything should be possible (including, in theory, loading another game into memory and executing it).)