Brothers follows the trend of games like The Last of Us and Journey, where the emphasis is not so much on the "game" but the experience, It's an amazing achievement in story telling and it's all done without any dialogue or even a single line of text. It can easily be argued whether or not this is a game per se, but one thing is for certain you don't want to miss out on this one.
The game's mechanics are extremely easy to wrap your head around, however it's in the execution that they become dynamic and essentially become the dialogue. Each character is controlled individually using the analog sticks while the left and right trigger correspond to each characters interaction with the environment. The interactive elements change depending on which brother you are controlling. For example, you reach a point in the game where something as simplistic as coming across a stray cat gives separate outcomes; the older brother causes the cat to hiss and claw, while the younger brother is the polar opposite. It's these series of events that continue to cascade into an extremely well told story that, ironically, would have been given a disservice through dialogue.
Brothers gets dark and morbid as the game progresses; unapologetically so. It goes hand in hand with the game mechanics as you'll notice if you make it to the bitter end. I completed the game in one sitting of about 3-4 hours and if you give it a chance I recommend you do the same. The puzzles aren't puzzles in the usual sense, they are more an exercise in dexterity but equally as rewarding without being too punishing. Picture yourself counting backwards from 100 in your head while verbally reciting the alphabet two letters at a time; YouTube would be so proud. There are secret areas you can find by exploring the branching paths and ultimately earn some achievements; this alone is what make Brothers a game in my opinion.
If you have $15 to spare pick it up on XBLA, PSN, and Steam. It's definitely worth the price of admission and will give a whole new outlook on what is possible of video game storytelling.