Colossal Cave Adventure
As of the latest version, you can now save your game! Note that save games might not work between releases, and that I may have managed to miss saving some state someplace, but it worked well enough to allow me to figure out what was wrong with the plover transport without going insane repeating the same steps over and over again.
Crash from Plover room
FYI the game crashes every time you try to go west from the Plover room.
So it does. I've fixed it in the latest version, along with the other problem, trying to Plover with the emerald, which would also crash the game. That only took me like two years to get around to doing.
Troll Bridge Errors
There are to error concerning the far side of the Troll Bridge. You still have the food, even after you've fed the bear. Also if you use the bear to frighten the troll, it doesn't tell you the troll has gone. You have to look to find him gone.
I have no idea what the license is on the original
Sadly I have no idea what the license is on the original ADVENT code, so I have no idea what licenses are actually available for modified versions.