The most recent game I beat was actually Trine with my friend during the free weekend.
I'd give it a solid 4/5. It's a VERY fun and creative co-op puzzle game, and I REALLY wish it was longer and was more difficult. The ending was the most fun part, but despite it being difficult we still managed to beat it on our first try. Still, for a game that's going for only 5 or so dollars now, it's definitely worth it if you have a friend or two to play it with. Just make sure you set it to hard, because anything else is really easy.
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