I stumbled onto an idea when doing a unit on telling time in kindergarten. I found many good interactive games online. I take a photo of the game and add a link to the site. Each day I add a new link to a page in Norebook and introduce the game to the kids in a quick two minute whole group lesson. Then the smartboard becomes one of their math center options. By the end of week I had five different online games that the kids can access from one Notebook page. We started rating them as one star, two star and three star difficulty level. Kids choose their preferred challenge level.