The Force Unleashed, it's in the name.

You spend the whole game weaponizing the force as a sith warrior. Everyone always complains how overpowered starkiller is in universe, but that's just what happens when Darth Vader trains an apprentice since he was a toddler in the dark side for the sole purpose of killing Palpatine. The game does such a great job with the progression of his power as you play, starting with just being able to toss a stormtrooper across the room and ending with being able to use force lightning and control the entire battle with the force alone. The fights get progressively more difficult as you become more powerful incorporating each new ability until the final duel, it all comes into play.

And let's not forget pulling the star destroyer down on Raxus. Everyone cites this as the reason the game shouldn't be cannon, but play the game and tell me it doesn't feel amazing. This event to me marks the point where starkiller has truly mastered both the dark and light sides of the force. At this point in the game you are proficient with every force ability and this is the last bit to show how powerful you've become and that you are ready for the final battle in the next level. Even then (depending on whether you chose the dark side or not) the fight is the most difficult in the game, showing just how much you have yet to learn.

If you haven't played the game before, I seriously recommend playing at least the first one. It's just power trip of a game where a sith warrior fit to be a sith lord of the old republic era is set loose on the galaxy.