Originally Posted by LordOfTheFish
How do you go back to replay levels?
Complete the game. Thats how you go back. Although, you have to start from the beginning, you get an added bonus - You get to keep everything you got from your last run through. Hilts, crystals, costumes, holocrons, and, powers. After I started over the first time, I was able to one shot everything up to Raxus Prime
(Except for Marek's daddy, Kota, and Desolous.)