A 3D puzzle game that focuses a bit more on physics related elements in which you have the ability to switch into five "dimensions" (including normal) that affect the physics and/or properties of objects around you. You play as a nephew visiting your uncle's mansion when the power goes out and he gets stuck in a small dimension.
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Pros
Pro Clever puzzles
The interesting bit about the game is how it has one solve puzzles. Users will use their Interdimensional Shift Device (IDS) to change many aspects of their environment, such as shifting time or changing gravity. SO for instance you could make a heavy object ligh, just so you could throw it across the room. It is through combinations of these tools that you will be solving complex puzzles. Luckily the puzzles never seem to convoluted, making for a fun puzzle game with clever solutions.
Pro Similar in feel to Portal
Quantum Conundrum, designed by Kim Swift (one of the creators of Portal) has a similar feel to Portal but with a lighter sense of humor and cartoony graphics. So for those that are looking for something very similar to Portal this would be a good choice.
Cons
Con Story falls flat
One aspect where this game does not improve over Portal is the story. There is a lot of eluding to a big reveal that eventually falls flat, making for a disappointing ending.