I think this is one of my favorite idea. Children think of everything as a competition, so by allowing them to see the good behavior of their peers would make them tighten up. I think this idea is a clear Way to let the kids know when to stop and what is going to happen if they don't.
Thank you to KS2 teacher Rachael for sharing her Boggle interactive display made using Twinkl Create! She's stuck the letters on using Velcro so they are really easy to change over. What words can you find? Easy - letters don't have to touch. Hard - letters of the word have to touch