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Vi Hart's doodling videos and a 4 year old son interested in mazes has made me wonder:

What are some interesting mathematical "doodling" diversions/games that satisfy the following criteria:

1) They are "solitaire" games, i.e. require only one player; 2) They require only a pencil and blank sheet of paper; 3) They don't rely on abstract mathematical language/substitutions. More precisely, I'm interested in "picture" type games with very simple rules, and not the cheeky answer: "mathematics".

What I'd really like to see is a game with simple rules that, out of the planarity of a sheet of paper, somehow "generates" a maze for the player from the "automaton" type rules...A good starting point may be a solitaire version of dots-and-boxes or something like this...

If such a thing is impossible, under certain simple desirable assumptions, I'd like to see proofs of such a fact, too.

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    This should probably be made [Community Wiki](http://math.stackexchange.com/privileges/community-wiki).2012-11-17
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    @robjohn: Already flagged it for CW....do you happen to know if it's possible to CW a question without moderator help?2012-11-17
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    If you don't see the Community Wiki checkbox when you start to edit the post, then you have to flag a moderator. I have converted your question to CW.2012-11-18
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    I don't ever see the checkbox when I ask a question...is there anything I can do about this?2012-11-18
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    Evidently, the Community Wiki check-box on questions is mod-only, so you have to flag a moderator to make a question CW.2012-11-18

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