If you are a BINGO fan, you are going to love SIGN-O! SIGN-O is the most entertaining way yet to learn American Sign Language (ASL) or just plain have fun using the signs you already know. You can play with any of the 21 categories of words, like Food or Numbers, or with all of the over 3,000 signs. It.s so easy to play! When a sign video appears, click on the English word on the gameboard that matches it. If you can match all the words in a row in any direction, you win!