In the book, it’s Wade’s earlier hacking that allows him to lower the forcefield. However, in the film it’s Art3mis who gets it down after learning the magic spell that dismisses the energy barrier (and due to her avatar being inside the field after she was put to work for IOI).

Why do you think Samantha went into IOI in the film, while it was Wade who went into IOI in the book? Why would the movie want to make that change? What is it about Samantha that the movie makes felt needed to change? Does it help or hurt her character and her relationship to Wade?
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Q&A Education