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

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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.
The Science Guy says: Jun 23, 2012. 11:03 AM
Awesome!

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

Ross
Kiteman (author) in reply to The Science GuyJun 23, 2012. 11:13 AM
Ooh! Take pictures!
The Science Guy in reply to KitemanJun 24, 2012. 4:08 AM
Finished!

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

IMAG0093.jpgIMAG0091.jpgIMAG0092.jpg
Kiteman (author) in reply to The Science GuyJun 24, 2012. 4:15 AM
That is awesome!
The Science Guy in reply to KitemanJun 24, 2012. 4:29 AM
Thanks!
chipper35 says: Nov 3, 2012. 11:54 AM
So simple, yet so wonderful!!
Kiteman (author) in reply to chipper35Nov 3, 2012. 1:26 PM
Thank you!
Kevin12345 says: Aug 20, 2012. 9:34 PM
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.
pinger_864329190.jpgpinger_864330646.jpg
Kiteman (author) in reply to Kevin12345Aug 20, 2012. 10:11 PM
That's a very nice job!
Rainh2o says: Jul 11, 2012. 6:52 PM
This would be a cool stocking stuffer made from small pieces of birch and balsa...great instructible! Voted for both! Good Luck!
Kiteman (author) in reply to Rainh2oJul 12, 2012. 1:35 PM
Thanks!
milkywaybar says: Jul 9, 2012. 5:17 AM
Following a similar concept, you could make a smaller version of This
emilyvanleemput says: Jun 30, 2012. 10:08 AM
Fantastic!
I'm deffinitly gonna try this
Kiteman (author) in reply to emilyvanleemputJun 30, 2012. 10:13 AM
Cool - post a picture when you do!
emilyvanleemput in reply to KitemanJun 30, 2012. 10:15 AM
I will :)
Cyberscann54 says: Jun 28, 2012. 4:51 PM
be even better as a full cube of layers
karlpinturr says: Jun 24, 2012. 5:38 AM
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) in reply to karlpinturrJun 24, 2012. 5:46 AM
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...
kaylaangelkisses in reply to KitemanJun 24, 2012. 6:00 PM
What about the cardboard challenge?
Kiteman (author) in reply to kaylaangelkissesJun 24, 2012. 11:03 PM
That's why I made a sideshow version.
kaylaangelkisses in reply to KitemanJun 25, 2012. 11:06 AM
ohh... X3
karlpinturr in reply to KitemanJun 24, 2012. 6:13 AM
Thanks.

A laser cutter would be a nice idea...

So might a 3D printer (except, I you'd lose the cardboard)... 
Jayefuu says: Jun 23, 2012. 9:31 AM
Is a 3 layer one coming next? That way you could increase difficulty and still keep it small.
Kiteman (author) in reply to JayefuuJun 23, 2012. 9:33 AM
That was a fast comment!

Yes, layers will be involved in future versions, as will more durable materials.
gmjhowe in reply to KitemanJun 25, 2012. 7:44 AM
Would make for a nice laser cut project too.
Jayefuu in reply to gmjhoweJun 25, 2012. 8:06 AM
We just had that conversation by PM :)
gmjhowe in reply to JayefuuJun 25, 2012. 8:56 AM
Already started drawing up some files!
Kiteman (author) in reply to gmjhoweJun 25, 2012. 9:19 AM
I have some hand sketches ...
rimar2000 says: Jun 24, 2012. 6:17 AM
Genial idea! Is it yours?

My granddaughters will be aMAZEd!
Kiteman (author) in reply to rimar2000Jun 24, 2012. 7:58 AM
I saw one that used marbles, once. I thought coins would make the maze easier to handle.
rimar2000 in reply to KitemanJun 25, 2012. 5:27 AM
Your improvement has a taste of genius, kiteman. I will do some for my granddaughters (please think something soon to simplify this last word).
ravenking says: Jun 24, 2012. 9:36 AM
What a clever idea! It seems like a fun project. :)
Kiteman (author) in reply to ravenkingJun 24, 2012. 10:13 AM
Yes, it is.
ravenking says: Jun 24, 2012. 9:36 AM
What a clever idea! It seems like a fun project. :)
BLUEBLOBS2 says: Jun 23, 2012. 7:18 PM
Very cool! You say it's pocket-sized? Enter it in the pocket-sized contest!
-BLUEBLOBS2
Kiteman (author) in reply to BLUEBLOBS2Jun 24, 2012. 4:15 AM
Already entered, just waiting to be accepted.
colorex says: Jun 23, 2012. 9:33 AM
I would freak out in pain trying to solve one of these...
Kiteman (author) in reply to colorexJun 23, 2012. 9:48 AM
This small version proved quite easy for Kitewife & Conker-X, but more challenging versions are coming.
colorex in reply to KitemanJun 23, 2012. 9:52 AM
Well, if you say so... But working blind and deaf is really frustrating for me.
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