I recently did this fun secret message project with my kids and it was so much fun that I had to share. Use it as a fun birthday card or lunch secret messages, it will keep them entertained for a few hours :)
My kids are both 6 and 4 and I thought this print out from Inspiration Labortories was perfect. (There are more complicated Cipher code print outs out there if your kids are older)
You will need:
Using the Blue/Yellow wheel, can you guess
1 3 21 21 13 26?