Parts Jenga and The Incredible Machine, Boom Blox's simple concept transcends itself with an incredible physics engine.
The mark of a great one, however, is one that not only is fun, but uses its engine and its concept in unique and original ways. Boom Blox is a concept of a good game: Gameplay is centered around different types of blocks and the properties it has. Sometimes you have to pull blocks away without losing the top block or you have to knock down certain blocks with as few throws as possible.
What makes Boom Blox great, however, is the implementation of the puzzles using these blocks. Using this simple concept, the game gets really creative with puzzles ranging from hitting a block at the right speed and angle to hit another block to hitting a single explosive block making a chain reaction in hitting others. Also, using other properties (like tennis balls, hoses and grab tools) add further to the game itself.
Problems? A few: Some single player puzzles tend to be too frustrating, due to the camera. Also, some single player scenarios, such as the Tower Defense-esque games, just aren't that much fun.
That is all fine however since you get an excellent and easy-to-use editor to fool around with. Creating puzzles and scenarios are fairly simple, but you can go as crazy and complicated as you'd like to. This adds a ton of replay value to a game that could easily stay in your Wii for months at a time.
All in all, Boom Blox is a simple game that was made much more compelling by its physics engine and its excellent use of puzzles. Puzzle fans will definitely want to purchase this, but multiplayer fans will also find tons of fun in this unique game.