Here's a link to the Nitty-gritty Rules, if you're looking to slather yourself in detail.
Micro Business Fanatic Newsletter

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The game is totally FREE,
Each month, one new business will be featured.
There are FIVE ways to score points (click below to explore):
You‘re free to guess on each biz until the Lock in date, when all guesses need to be locked in. You can change them anytime before that.
Every 90 days, starting on May 15th, 2010, two players will be awarded the Ultimate Prize: a spot on the next Micro-palooza Getaway to Lanai, Hawaii.
Here's a link to the Nitty-gritty Rules, if you're looking to slather yourself in detail.