Wrote a terminal for DoomRL that remembered where globes were after the player saw them and continued to display them until they were determined gone? I find one of the hardest things while playing can be remembering if and where I saw a globe. I think it technically isn't cheating because it's only using information (past and present) that was already given to the user, but sometimes I can go a little too far.
It's worth noting that the terminal is already written. It doesn't implement the entire VT spec, but enough of it to display DoomRL almost correctly. I still need to find exactly what characters are in the DEC Special Character and Line Drawing Set and their UTF-8 values, so there are a few things that display with the wrong symbol. The 'remember globe' feature hasn't been written, but I'm thinking about it. If you are wondering why I wrote it, it's because I wanted to resize the window.