Hints:

Installing the patch can cause lockups when you're trying to play games saved with the old version. To save your progress, copy your latest save-game file created with the patch to a temporary folder, reinstall the old version, then load the game and immediately save. Copy the save-game file created with the patch to the one that was just created in the Clue directory, using the name of file you're copying over. You'll still see the old save-game snapshot at the Load Game screen, but clicking the Save button will restore your patched savegame and save all your progress.

Jot down the riddles whenever suspects recite them. If you don't manage to get it all, just go back and ask them once again these robots are more than happy to repeat themselves all day long.

In several scenes, the forward and backward arrow icons change to mean "look up" or "look down," which usually indicates that there's something important you need to check out in one of those directions