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Terry's battle of wits involves a mission to stack 100 lbs. on an egg without cracking, and an obstacle course for your memory.

Guy's battle of wits involves a helium-fueled race where it pays to be the slowest across the finish line, and a super-sized packing challenge.

Terry and Guy battle the elements in Randy's big word challenge, and test their engineering skills in a bridge build-off.

The geniuses try to prove their smarts by decoding Guy's gauntlet of pattern puzzles.

A paper-airplane engineering challenge is issued.

The geniuses are challenged to build a self-propelling boat using simple materials.

Terry and Randy have an hour to count more than 1,000 baseballs and then use a complex equation to stack them in a pyramid.

A super-size classic logic puzzle is used to attempt to stump the guys, and Terry miniaturizes an ancient weapon in an effort to catapult himself to victory.