We saw the idea HERE – and it turned out really well. We needed colored printer sheets, masking tape and felt-tip pens. We wrote the letters from 1 to 9 and colored them. Then me and my daugher taped them to the floor (her job was to give me the right number every time). You can leave the paper on the floor for a few days – the masking tape will stay in place but won’t leave any traces when you decide to remove it.
It took me some time to remember the exact rules for playing this game.