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It's been quite a while since I read Ender's Game by Orson Scott Card, so this review will not be able to provide an in-depth look at the differences between the book and the movie; however, I will do my best to compare and contrast the story's execution in these two mediums.
Right off the bat, I was impressed by how well the plot was compressed. Obviously, this compression had faults, the main one being that the movie did not give an accurate idea of how much time passed during Ender's training. This made the story unbelievable to those who had not previously read the book.
I thought that the movie did a good job of showing the simulations, but I found that I wanted more from them. Since the majority of the story is set in space, I wanted more explanation of the way that training worked without gravity. I also wanted more insight into the strategies that Ender creates during training, since I recall that being a significant chunk of the novel.
All that being said, I really enjoyed the movie. I'm not sure how much sense it would make to someone who hasn't read the book, but I personally really enjoyed this movie separate from the book. I thought that it was a good adaptation, and can't think of any plausible ways that it could be improved without it being super long. Overall, it's an entertaining and well done movie, but, as expected, it doesn't compare to the book.