From the box:

Four mad professors locked in a lab cooking up potions, conjuring a trap!

Inside the flask bouncing around, lurks their creation trying to get out.

Everyone's wary, passing the flask. No one is sure when the cork will go pop!

MAD LAB is the manic game where you don't want to be GLOOPED by a LITTLE GREEN MONSTER!

Keep the flask moving, ducking this way and that - any time now it's going to go BLAT!

Three strikes and you're out. Last one alive makes it out of the Mad Lab!