Rack 'em.
1. Knights of the Old Republic
2. Shadows of the Empire
3. Knights of the Old Republic II
4. Battlefront (haven't played 2; I know, I know)
5. Rogue Squadron
Runner-up: Galactic Battlegrounds
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5: Battlefront 2 Episode 2 4: Battlefront 2 Episode 2 Part 2 4-1: Battlefront 2 Series 2 Episode 2 Part 2 2: Battlefront 2 Book 2 Series 2 Episode 2 Part 2 1: Half Life 3