My son received this for a birthday gift. We own another I SPY computer game and it worked great. This one would not even launch. It was given as a gift purchased through Amazon but wrapped up and handed to my son, not given through the mail, so no packing slip. I tried to return this. First, I needed to know the giver's email address and home address to verify that this was indeed bought at Amazon. Fortunately, I had that information. The customer service person verified the game was bought at Amazon, but through a third party seller, so they were not obligated to honor a return. She did send me the third party information. They would not take opened software back. How do you know it doesn't work if you don't open it up and try it? I just spent eight dollars UPS shipping it back to Scholastic in hopes of an exchange. Other I SPY games do work on MACs, but this one did not. If you are going to try this, buy it from a store which will take it back if it doesn't work.