The fastest growing genre in video games is "brain training," a genre no one had even heard of before last year.
But it only takes one smash hit — in this case, Nintendo's "Brain Age" — to launch an armada of imitators.
Nintendo's rivals have tried to hop on the "Brain Age" bandwagon with copycats like "Brain Boost," "Brain Genius," "Brain Juice," "Brain Challenge" and (for the sake of variety) "Mind Quiz."
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The only person who might need so many brain exercise games would be someone who was dumb enough to buy them all.
The jury is still out on whether these games — consisting mostly of simple, rapid-fire math, logic and observation problems — really make you smarter.
I'll try to answer a more important question: Are brain training games any fun?
It presents a collection of 15 problems; the faster and more accurate you are, the bigger your "brain size." That's ridiculous, of course, but kind of charming anyway.
The brainteasers range from the simple (pop numbered balloons in order from lowest to highest) to the slightly less simple (lay down train tracks in a brief maze). There's nothing a third grader couldn't handle.
The Wii introduces a couple of entertaining multiplayer modes, letting you challenge your friends to see who can solve the most problems in the same amount of time.
The biggest drawback to "Wii Degree" is the limited number of activities; a $50 product ought to have a lot more than 15 minigames.
It takes less than an hour to see everything "Wii Degree" has to offer, although the head-to-head contests are enjoyable enough to keep you coming back.
Two-and-a-half stars out of four.
—"Hot Brain" (Midway, for the PlayStation Portable, $29.99): "Hot Brain" may sound like a disease, but in this game it's the goal: Raise the temperature inside your skull by solving another batch of 15 problems.
Again, that's not enough for a full-price game, although "Hot Brain" does add some language challenges, such as matching rhymes or putting words in alphabetical order.
The tests in "Hot Brain" are surrounded by a desultory story involving a wacky scientist (voiced by Fred Willard). These sequences look nice, but since they have nothing to do with the game you'll want to skip them after the first few times.
"Hot Brain" also has a couple of multiplayer modes, but they aren't very compelling.
The other major drawback of "Hot Brain" largely lies with the PSP: The loading times in between games are too long and too frequent. But if you don't own a Nintendo machine, "Hot Brain" may be a good place to get a glance at the whole brain-training fad.
—"The New York Times Crosswords" (Majesco, for the DS, $29.99): Millions of people get their regular brain workout from the old-fashioned, low-tech crossword puzzle.
The premier puzzle in the United States appears every day in The New York Times; this package collects 1,000 crosswords from the Times archives in one slender digital package.
Logically enough, the puzzle clues appear on the DS's top screen, the crossword grid on the bottom. You can zoom in and out of different sections of the grid, then either type your answer with an on-screen keyboard or write it with the stylus. (The handwriting recognition here is very accurate.)
It's easy to erase letters or ask the computer for hints.
I still prefer solving with pencil and paper, but I love having so many puzzles close at hand. It would cost about $50 to buy books with this many puzzles, and they would weigh a lot more. With hundreds of hours of fun, this is a great bargain.