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This is unbelievably addictive. My son tries to make impossible levels for me and I make levels that will help him with problem solving skills. He gets really excited wanting to see what I've made, it's a great game for us.
It's as exciting making the level as playing it and it amazes me that Nintendo have had the genius idea, they really manage to know what people will love to play that hasn't been done before. I hope they can take this idea further for newer versions.
Decent 7/10 for a 3DS game, 5/10 for a mario game. Well worth a playthrough, even if just playing the pre-built levels. A good few hours of play. The selects version for 13.99 is a reasonable price but I wouldn't want to pay much more.