LSAT Logic Games seem like the hardest part of the test. Don't worry - that's just because they're totally unfamiliar. It's the easiest section to improve at.
The key is taking the time to learn good diagramming techniques, and drawing good setups. Be sure you've got the rules right before moving on.
Repeating games is a very useful way to master them. I found that when I taught the same game to five different students, I got much better at that game and at all similar games.
Here are some of the best logic games posts from this subreddit, as well as some useful outside resources.