Q.U.B.E (Quick Understanding of Block Extrusion) is a PC puzzle game released last year. One thing everybody will note is that this game was clearly influenced by the Portal series, your character will spend the majority of time in white, pristine test chambers. The major success of this game is the style of puzzle featured in this game is comepletely different from Portal, teaches you the methods of solving the puzzles quickly (something also achieved by Portal) and uses these methods to create unique problems for you to solve.
As you probably guessed from the title, the game is based around manipulating blocks, each colored block performing differently from the other. at the start you are introduced to 3 different blocks, and the game gradually adds more complicated features (such as spinning certain sections of the room) the difficulty curve feels natural, you won't be banging your head against the screen in a futile rage, with a little bit of creativity, combined with what you learn in the previous stages, you'll get immense satisfaction once you clear a stage.
Unlike Portal, this game is strictly focused on puzzles, there is no narration or real plot to speak of. the game may be missing Portals charm and humor but the actual gameplay is so satisfying that to me it didn't really matter.
I can heartily recommend this game to fans of puzzle games or anybody that likes a challenging but fair title to enjoy, although some may bemoan the lack of level editor