Good Riddles

Question: You create your own Where's Waldo game on a piece of paper. You want your friend to find Waldo but they think you might be pulling a prank on them by not putting Waldo on the paper at all.

How can you prove to your friend that Waldo is on the paper without ruining it for them?

Question: Looking at my face, I'm no more than six.
Look at the rest of me and I'm 21.
You'll see my twin and me in Las Vegas.
Say my name and you'd be uttering a threat.

What am I?

Question: When is... 5>0, 0>2 and 2>5? Hint: Hands

Question: I guide you but you can't hear me. Without me you would be lost. I keep going and won't be stopped. What am I?

Question: Mom and Dad had four girls. Each girl had one brother. How many people are in the family?