Truth is definitely a joke game, but unlike most, it is well implemented and bug-free, as well as being much more clever. The premise and the puzzles are simple: expose the lies surrounding you. The scenario is realistic and thus provides a humorous commentary on the everyday lies we endure in the man-made world.
The real puzzle of Truth is finding ALL of the lies, not any single lie. For the most part they are found in the places you would expect: advertising, politics, the Internet. But some are subtle and require a lot of attention to detail. As the world is rather small, this can be a little tedious, and I am ashamed to admit that after extensive puzzling I could only uncover 19 of the 21 lies, and thus was driven mad.
I recommend this game as a short and well-written diversion that will definitely put a satirical smile on your face and even occasionally make you laugh out loud.