Cubetastic: probably the hardest and most challenging puzzle game you will ever play.
The game looks solid and well constructed, it's unique in it's puzzle dynamic and nice to look at. It's not really my kind of game but I sat and played it through for a bit and I found it enjoyable. The puzzles didn't get too hard too quickly and I found myself eager to attempt to solve puzzles. The only thing I found is that it got quite repetitive.
A nice little game for a break or in my example when I wait for my workstation to finish rendering. The only hard thing sometimes is to get back to work.