While playing a game, press [Ctrl] + [Alt] + [Shift] + [End]. Note: You will not collect money from the current mission.
Blooper mission
Note: This procedure involves editing a game file; create a backup copy of the file before proceeding. Use a text editor to edit the "user.cfg" file in the game directory. Add the following lines to the file, then start the game and begin a new mission:
play
starting_mission 16
Alternately, install Dromed from the Goodies folder on Thief Gold disc one. Then, start Dromed and open mission 18. Press [Alt] + G after it loads to enter the game.
Level Creator
To create your own levels, install Thief Gold to your system (full install), then goto the goodies folder on the CD and unzip DromEd to your Thief folder. Goto it, and you can create your own levels, edit levels, and play fan missions.