The Super Mario series like so many others is brimming with secrets, some of them interesting, some of them not so much, but we're sure few would argue the best secrets take the form of complete levels for you to play.

That's why we've thrown together what may well be the top five secret levels from the entire mainline Mario series, but we've limited ourselves to one level per game to give everything beyond Super Mario World a chance. Check out the video above and let us know what your favourite secret Mario levels are in the comments below.