Here's approximately how long Nintendo's Super Mario Bros. Wonder takes to complete depending on your playstyle.
How long is Super Mario Bros. Wonder?
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Super Mario Bros. Wonder - Plugged In
Super Mario Bros. Wonder' review: Nintendo's masterwork dream machine : NPR
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Super Mario Bros. Wonder Review
Rumor: Super Mario Bros. Wonder Is As Difficult As Super Mario Bros. 3 – NintendoSoup