The game presents you with several different puzzles made up of blocks in a range of colors. When you start a puzzle, the blocks will be scrambled and your job is to put everything back in order in as few moves as possible.
The game has a distinct, New-Age tone to it: When you succeed, it will give you a compliment like, "You're an iridescent moonbeam!" and the various levels are named Mystic, Prophet, Guru, and so on. While a little odd at first, I eventually found the magical language comforting. Plus, the name of the game itself is pretty cute.
One important thing to note: "I Love Hue" is entirely based on color, so if you have trouble discerning between two very similar colors or have color blindness, this is not the game for you.