I've been playing the Terraria update for a while and it's pretty fun. The game is already huge will a ton of content that you can easily spend a ton of hours on it.
MXL alternative is real life for me. Between work, friends, my villa, my car and the car club I am part of, there isn't really anytime left to play games... Imagine if I had a girlfriend... At least I check the forums everyday at work when things are slow or when its lunch time.