This is a work in progress game by Chris Read which was posted about in the Facebook 2600 Homebrews group. You are Bob, who is trapped in the mysterious and deadly Castle of Doom. You must make your way from cell to cell to find an exit from the castle. Beware the deadly denizens of this creepy castle.
Move with joystick, jump with fire button. Push up to enter doors. Download here: Dropbox (https://www.dropbox.com/s/1nuu78s21y2jb1n/Castle%20of%20Doom%20b.bin?dl=0).