Last week, I interviewed the makers of the new, performance-enhancing pill for gamers called "FpsBrain."

I also spoke with a registered dietitian about it, and she likened the pill to most energy drinks out on the market.

Then yesterday, our friends at Kotaku published a pretty comprehensive feature on energy drinks, comparing the different brands' ingredients, tastes and effectiveness.

But there are two drinks that courageous (and no doubt bouncing-off-the-walls) feature writer Mike Fahey didn't try: the Nintendo-brand energy drinks Donkey Kong Jungle Juice and Power Up Energy Drink.

Granted, Fahey probably doesn't live near a Nintendo World Store, so I walked a few blocks from our Times Square office to Rockefeller Center, where I purchased the two drinks for $1.99 each.

Here's what I tasted...

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Getting your butt handed to you in "Halo 3"?

Take a pill.

About two weeks ago, news of a performance-enhancing pill for gamers made its way around the Internet. Dubbed "FpsBrain" and made by German computer-makers Tomarni, the product promises that a person will have a "remarkable increase in perception and reaction capacities."

To boot, the website claims that their staff uses FpsBrain four times a week to "enhance their mental performance and their work efficieny [sic]." If it doesn't work, the company promises "a 110% money-back guarantee."

Sound like a sketchy, late-night infomercial? I thought so too.

So last week I got in touch with the Berlin-based manufacturer and had an e-mail exchange with CEO Thomas Straßburg. And since I'm no expert on "energy drinks" and performance-enhancing supplements, I also e-mailed a registered dietitian to answer my questions regarding the ingredients of FpsBrain. Here's what I learned...

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