Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

Let me give you an example: I've read this book with much expectation, it was very boring all through out the book
The answer to this example can be: Negative
Here is why: Review writer does not like the book because it was boring, therefore it is a negative review.

OK. solve this:
I play this with my grandchildren. It teaches us both the value of a good memory and is challenging for all. You sometimes miss the most obvious. Lots of fun--tic tac toe with a twist!
Answer:
Positive