Can You Solve the Two Points in a Square Puzzle? This one is really hard — you need to know calculus and probability theory!
Don't Be Surprised If You Can't Solve the Passcode Riddle If you can’t, you’ll be fed to mutant salamanders!
Can You Figure out When Denise’s Birthday Is? You are going to need a pencil and eraser to solve this puzzle. Make sure you try it on your own first!