Logray NOT needed for C3PO
I'm sure Logray makes it easier but I did without him. I did it with Chief Chirpa, Teebo, Wicket, Elder, and Paploo. I beat them in the order of Chewbacca, Han, Tank, R2, Leia, and then C3PO. Big ...
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Paploo isn't a must either, did it with Logray instead. There are plenty of viable options just take out Chewie and it all comes together.