Without engaging games to challenge them, bored people would resort to risky entertainment such as skydiving to work or explaining string theory to prides of hungry lions. Enjoy beneficial, stimulating playtime with today's Groupon: for $25, you get $50 worth of brain-challenging merchandise from Marbles: The Brain Store. The handpicked, expert-tested party games and products from Marbles boost brainpower while entertaining partakers of all ages. Challenge and captivate your squishy gray matter with games, puzzles, software, books, and DVDs to build up critical thinking, improve memory, boost coordination, sharpen visual perception, and advance word skills. Bulk up frontal cortexes with multiple rounds of abstract strategy during Hive ($29.99) or roundly trounce competitors with Appletters ($16.99), which combines the elegant word building of Scrabble with the utter brutality of the produce aisle.

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Marbles: The Brain Store has received a lot of press, including features on MSNBC's Your Business, Fox News 11 and CBS 11.