GMastermind
The well-known mastermind game.
Drag-and-drop colors from the palette or from the board itself. The object is to determine the hidden combination of four colors. The game may be played in two modes: with replacement, which means that colors may repeat, and without replacement, which means that colors are unique. The user selects a choice of four colors and "commits" them. The program replies with an evaluation -- a black peg for a color that is placed correctly, and a white peg for a color that is in the wrong position. The user may make a total of eight queries.