You can use this tutorial to learn how to play the game of Maw.
The official rules of Maw are outlined inside The Groom Porter's Laws which appear in Ancient Ballads and Broadsides published in England in the sixteenth Century… as preserved in the Library of Henry Huth, London, 1867. (yes, that's the entire title) I found out about this marvelous book through Partlett Games where he adds “There is a copy [of this Ancient Ballads book] in the Bodleian Library. I am grateful to Thierry Depaulis for communicating this discovery.” Source
I am grateful as well to Thierry Depaulis, but as I don't get to Oxford as often as I would like, I hoped there was a digital version to be unearthed somewhere.
So I went looking for one, and I found a copy of something that claims to be that ballad book, but when you click on it, it says on the title page that it is “A collection of seventy-nine black-letter ballads and broadsides: printed in the reign of Queen Elizabeth, between the years 1559 and 1597 : accompanied with an introd. and ill. notes” Either way, you can see the list of the laws for how to play on pages 123-125 (though the digital bar at the bottom will tell you it's pages 121-123, but that does not correspond with the page numbers listed on the pages themselves). Read the book here
Other books and references used when putting this tutorial together: