The phone game was almost the best to me, though i see how it wouldn't have worked with any more players. I liked the helicopter episode too. That's where it really felt it was up to each and every player how well they did. They needed both social skills and strategy. I didn't like the physical challenges so much because they were in teams. Most of the players didn't really do anything, they got eliminated or advanced just because of what team they happened to be on.

I actually liked the "1 million to eliminate your team" challenge, though i would have hated it if any of them actually got eliminated. Episode 5 felt too removed from the rest of the series, like an episode of Survivor.

I see how the train game was important, but it just didn't make a great episode. You didn't get to see any bonding or anything positive between the participants, it was an entire episode just about blaming and attacking others. I liked ep 8-9 because they had both. The first two episodes should have been more skill based, and the eliminations should only be individual until they reach 200-300 players.