To start off the younger kids decoded a simple symbol substitution, which was incredibly easy, but very much enjoyed. For the older kids we did this worksheet, which was quite a bit harder.
While they were busy doing that I set out the secret messages.
Afterwards they got to have a try at writing in invisible ink (AKA lemon juice). Later we’re going to try revealing what they wrote. I’m hoping to be more successful than the last time we tried this.
It’s hopefully going to work well.