Skill Activity: Main Idea Literacy interactive in which topic is selected and then the topic sentence (or idea) is clicked. If you're right, you get to uncover tiles that lead to solution of a riddle. Get to uncover number of tiles relative to tries it took to get it. Lots of science topics. Interactive from Harcourt School Publishers By pdboyerin Interactive Whiteboardwith activityiwbliteracymain_ideareading