Summary: Well, neither. It is a fun game, as others have mentioned, that seems to have been perfect for the Wii, and takes full advantage of the Wiimote's capacity to use motion control. Gameplay is brisk but challenging - sometimes extremely challenging - and the sound and presentation are solid, if unspectacular.
Summary: I'm not a big puzzle fan, but Mercury Meltdown: Revolution is a pretty fun little game. The goal is to guide a blob of mercury to the end while losing as little of it's mass as possible. Yes, this is a puzzle game, and many stages will require some in-depth thinking before you can figure out exactly how to navigate the obstacles.
Summary: I never heard of it before and yet I like the games where you move an object around or through a course like marbles. It's cool that you have to make the mecury different colors to unlock paths. i hope the time limit isn't short from what I saw from the video gameplay.
Summary: Fabulous game. It combines the use of logic and puzzle solving with the dexterity in movin the mercury through the puzzles and mazes. I play with my 6 year old and she enjoys it as much as I do. Has quickly become our favorite wii game.