On Star Wars Battlefront 1, you can not get a lightsaber.
However, you can play as a Jedi or a Sith on Star Wars Battlefront
2, Renegade Squadron, and Elite Squadron.
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Most reviews have equal reception between the two, but a small
bit more for Renegade Squadron.
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you have got to get all the medals and complete the campaign on
Jedi master difficulty.
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Renegade Squadron is only for the psp. It will not come out for
any other platforms.