This is a very developed interactive tic-tac-toe game, with 29 separate game slides.  To place a mark on the grid, learners must answer a question correctly.  When the grid place is selected the energy, heat and light questions appear on the screen and then the answer appears when you choose to proceed. There are some relevant and humorous but non-essential sound effects.  It is not clear how to get x's and o's to appear on the screen.