Picture of Penny Maze
I'm presenting here a pocket-sized puzzle in the first of several versions, depending on your skills, materials, tools and target audience.

In every version, though, you drop a small coin in one slot, and need to get it out of the other slot.

This first version is quick and easy to make (it took me less than thirty minutes from idea to finished item), and small enough to keep in a pocket.  It is also perfect for making with children, as a diverting way of filling an afternoon.
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Step 1: Materials

Picture of Materials
To make the "easy" version, you need thick card, something to cut it, and something to glue it.  If you are using a craft knife to cut the card, a metal ruler is also very handy.

The card needs to be as thick as the coin you design it for.

Almost any glue will do the job - PVA, glue-stick, etc.

Note: when it comes to cutting out the parts of the maze, a laser cutter would be very handy.  It would also make it a lot easier to make larger, more challenging versions.

Step 2: Design

Picture of Design
For the most simple version of this maze, you need three pieces of card, identical in size.  For coins like the US dime or UK 5p piece, something slightly larger than a credit card makes a good size.  Rounded corners will resist damage in your pocket.

In the middle layer, draw a path across the card.  It's up to you whether you include dead-ends or not.
piesafety made it!3 months ago

Made two, my friends were crazy and I memmorized the maze so money making time!

Kiteman (author)  piesafety3 months ago

Haha, enterprising!


Going to go and attempt a multi-level one just now!

Kiteman (author)  The Science Guy2 years ago
Ooh! Take pictures!

Once you get to three layers it gets difficult even when you know the route.

Kiteman (author)  The Science Guy2 years ago
That is awesome!
piesafety3 months ago

how do you make a multi-level maze? i want to make i so help me!

Godd job too.

Kiteman (author)  piesafety3 months ago

See Science Guy's post, or my other maze:

piesafety Kiteman3 months ago

and what size is the cardboard square you use?

Kiteman (author)  piesafety3 months ago

This one is about 60mm square, but there's no real rule about that.

We build a wooden one in my woodwork shop in my middle school
Kiteman (author)  steveywevey1 year ago

From this instructable? Could you post an "I made it" picture?

I'm deffinitly gonna try this
Kiteman (author)  emilyvanleemput2 years ago
Cool - post a picture when you do!
I will :)
Argh, still. need. to. try. this out!!!
safay1 year ago
Love this project, especially that it reuses waste to make a toy.  I developed this into a Hacker Scouts Open Lab and tried it out this weekend.  Here's a blog post about it.  The kids and parents loved it.  Thanks for the awesome instructable!
Kiteman (author)  safay1 year ago
Oh, that's very cool - how long did they take to make them?
chipper352 years ago
So simple, yet so wonderful!!
Kiteman (author)  chipper352 years ago
Thank you!
Kevin123452 years ago
I saw your instructable this morning and after an hour of work i have one to call my own. It was easy to make when i planned it out on 1/4" graph paper, then glued that to the cardboard and added in walls one at a time. paths are 1" wide and walls are 1/4". The entire thing is 5 1/4" square. It fits a nickel.
Kiteman (author)  Kevin123452 years ago
That's a very nice job!
Rainh2o2 years ago
This would be a cool stocking stuffer made from small pieces of birch and balsa...great instructible! Voted for both! Good Luck!
Kiteman (author)  Rainh2o2 years ago
milkywaybar2 years ago
Following a similar concept, you could make a smaller version of This
be even better as a full cube of layers
karlpinturr2 years ago
Nice, simple and addictive - 3 thumbs-up, minimum.

Couple of questions:

Just how big is it? I suppose it depends how big your pockets are, but if the 5p is 18mm square, I guess the whole thing's about 70mm square overall...?

Which leads into the 2nd question - what's the lateral clearance?

Kiteman (author)  karlpinturr2 years ago
It's actually 60mm square - the clearance around the coin is around 1mm, but if I won a laser cutter*, the clearance would be even less.

*Not that I'm hinting about votes...
What about the cardboard challenge?
Kiteman (author)  kaylaangelkisses2 years ago
That's why I made a sideshow version.
ohh... X3

A laser cutter would be a nice idea...

So might a 3D printer (except, I you'd lose the cardboard)... 
Jayefuu2 years ago
Is a 3 layer one coming next? That way you could increase difficulty and still keep it small.
Kiteman (author)  Jayefuu2 years ago
That was a fast comment!

Yes, layers will be involved in future versions, as will more durable materials.
gmjhowe Kiteman2 years ago
Would make for a nice laser cut project too.
Jayefuu gmjhowe2 years ago
We just had that conversation by PM :)
gmjhowe Jayefuu2 years ago
Already started drawing up some files!
Kiteman (author)  gmjhowe2 years ago
I have some hand sketches ...
rimar20002 years ago
Genial idea! Is it yours?

My granddaughters will be aMAZEd!
Kiteman (author)  rimar20002 years ago
I saw one that used marbles, once. I thought coins would make the maze easier to handle.
Your improvement has a taste of genius, kiteman. I will do some for my granddaughters (please think something soon to simplify this last word).
ravenking2 years ago
What a clever idea! It seems like a fun project. :)
Kiteman (author)  ravenking2 years ago
Yes, it is.
ravenking2 years ago
What a clever idea! It seems like a fun project. :)
BLUEBLOBS22 years ago
Very cool! You say it's pocket-sized? Enter it in the pocket-sized contest!
Kiteman (author)  BLUEBLOBS22 years ago
Already entered, just waiting to be accepted.
colorex2 years ago
I would freak out in pain trying to solve one of these...
Kiteman (author)  colorex2 years ago
This small version proved quite easy for Kitewife & Conker-X, but more challenging versions are coming.
colorex Kiteman2 years ago
Well, if you say so... But working blind and deaf is really frustrating for me.