Flick! Whiteboard by Tejinaya & Lumos
Draw letters and illustrations on the whiteboard, flick them with your fingers, and they will change instantly. The money you draw on the picture changes to the real thing, the letters you write change to other characters, answer to the card, answer to the quiz, surprise message, etc.
There are many things you can do! You can come up with your own ideas!
Online instructions included.