FB4 - Google Foobar - Free the Bunny Workers & Escape Pods
Level 4: The Real Coding Challenge
FB3 - Google Foobar - Doomsday Fuel & The Grandest Staircase Of Them All & Fuel Injection Perfection
Level 3: The Reading Comprehension Challenge.
FB2 - Google Foobar - Gearing Up for Destruction & Don't Get Volunteered
Level 2: The Math Challenge. Find the formula is the main part.
