Find the cup containing the die...
Here's what other people have to say about Thimblerig:
The objective is simple: you should try to remember which cup contains the die. After the cups have been shuffled, click on the cup you think contains the die. If you are right, you'll advance to the next level. If you are wrong, the game restarts. Levels become increasingly difficult. Although this game is widely known to be a con trick, I promise you that the computer plays fair.
After you have played the game, you will be asked to enter your name and some other details. This information, together with your solution time, can be sent to the WWW server. If you do so, your name may appear in the hall of fame.
I am sorry, I cannot give you permission to install Thimblerig on your site. The game has been sold to a client using an exclusive license. It prohibits me to put the game on any other site but my own.