All levels unlocked.
Use your mouse to locate and sometimes combine objects, interact with the environment, activate the thieves' unusual powers and click through the dialogue. There is quite a lot of conversation and banter that occurs between the three thieves, and although it's tempting to click through it the dialogue actually adds to the charm and the humor of the game. The game itself is not overly challenging, with only the ocassional pixel-hunting moment, but there's the relieving presence of a changing cursor to alleviate any minor frustration. There may be the presence of a slight glitch or two, but they're not game-breaking. I've played The Three Thieves quite a few times, and any glitches occurred only rarely.