Here are 10 of the most difficult Logic Games. I've included classifications of each game after the game's topic. (Get the below LSAT PrepTests here.) Enjoy!
1. PrepTest 23 (October 1997), Game 2 - Applicants being interviewed and hired (Combination: Grouping: Selection and Grouping: Splitting)
2. PrepTest 24 (December 1997), Game 3 - Juarez and Rosenberg review introductory and advanced textbooks
3. PrepTest 25 (June 1998), Game 2 - Tourists and Guides (Grouping: Matching)
4. PrepTest 27 (December 1998), Game 2 - Lizards and snakes in a reptile house (Combination: Linear and Grouping: Matching)
5. PrepTest 31 (June 2000), Game 2 - Music store's new and used CDs (Grouping: Selection / In and Out)
6. PrepTest 33 (December 2000), Game 3 - Stones: rubies, sapphires, topazes (Grouping: Selection / In and Out)
7. PrepTest 34 (June 2001), Game 4 - Randsborough/Souderton Clinics (Grouping: Splitting)
8. PrepTest 36 (December 2001), Game 3 - Window and aisle seats on a bus (Advanced Linear)
9. PrepTest 40 (June 2003), Game 3 - Flight connections on Zephyr Airlines: Honolulu, Montreal, Philadelphia, Toronto, Vancouver (Grouping: Mapping)
10. PrepTest 57 (June 2009), Game 3 - Dinosaurs: iguanadon, lambeosaur, plateosaur, stegosaur, tyrannosaur, ultrasaur, velociraptor and Colors: green, mauve, red, yellow (Combination of Grouping: Selection / In-and-Out and Grouping: Matching).
Check out my Dinosaur LSAT Logic Game Explanation.
Also see: 5 Hardest LSAT Logical Reasoning Questions, Difficult LSAT Logical Reasoning Questions, and 5 Hardest LSAT Reading Comprehension Passages.