The first thing that stands out in the QUBE 2 demo is the level of polish applied to the environment. It's a gorgeous game. Set in a massive, bright laboratory type of building, players manipulate blue, green and red blocks, using them to solve puzzles strewn about the world. The blocks pop against stark white and black rooms, making the entire game resonate with light and color.

The puzzles themselves are challenging and thus satisfying to solve. Each block has a different function: Place a red square on the proper "block-building" space and it creates a long rectangle; the green tool creates a solid block that can fall or fly when pushed by a fan; and the blue square is a launch pad, capable of flinging the protagonist and blocks alike across the landscapes.

Some of the gameplay in QUBE 2 will feel familiar to fans of the Portal franchise. A few of the puzzles involve placing blocks on pressure plates to open doorways or unveil staircases, and the ominous feeling of the lab adds a lovely layer of mystery to the entire game. However, this isn't Portal. QUBE 2 limits the ways players can use each tool: You can't simply pick up and move a green block wherever you'd like, for example. Instead, players have to use blue launch pads and red barrier blocks to make the rooms obey their will.

Even though Toxic Games has stripped down QUBE 2 to these three basic elements -- red, green and blue blocks -- the puzzle possibilities seem endless. Players will be able to see for themselves when QUBE 2 comes to PC, Mac and Linux this summer.

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