It's easy to play. Follow the instructions and do what Code
Monster says. If you get stuck, just skip to the next lesson.
You can always come back to it later!
Click on the Reset button if you really mess up your
code and want to start over on a lesson. Click on the Back button
to go back to a previous lesson. You can jump to a specific lesson
or back to the beginning using the "Lesson Sections" link.
Code Monster saves what lesson you are on, so feel free to stop
at any time and come back later. As long as you come back on the
same browser on the same machine, you'll get back to your lesson.
Jump to a Lesson Section
Code Monster from Crunchzilla is an interactive tutorial for kids
that focuses on action. Code changes immediately yield
Projects start with simple boxes and colors, rapidly progressing
into exciting experiments with simple animation and
fractals. Important programming concepts like variables, loops,
conditionals, expressions, and functions are introduced
Code Monster is a gentle and fun introduction to
programming concepts. It is a first step in learning to program. It is
not intended to teach all of computer science and programming.
Code Monster is based in Seattle, WA. It is part of the
Crunchzilla suite of game and educational projects developed by
Frequently Asked Questions
What is the c in things like c.save()?
It's a little technical but, if you want to know the details, c is a variable Code Monster creates for you that contains the Canvas' 2D context.
The code that creates the variable c, which is hidden, looks like
var c = document.getElementById('pane').getContext('2d');
How can I save my code and use it outside of Code Monster?
Short answer: It's not super easy, but you can copy-and-paste your code and then load that code in
Longer answer: A minimal HTML file that works would look like this:
<canvas id=pane width=400 height=300></canvas>
var c = document.getElementById('pane').getContext('2d');
// PASTE YOUR CODE HERE
If you copy that into a file, then copy-and-paste your code into it, then
save the file with a filename ending in .html, you should be able to load the
file in any web browser.
Is there any other code that is hidden from me?
There is also a bit of hidden code to try to stop animations when you
change lessons and the code you write is instrumented to try to
prevent infinite loops. You shouldn't need those to run your code
outside of Code Monster.
programming by explaining what a variable is, what variable scope is, what the syntax
of an if statement looks like, how each of the operators work, and so on. If you want
that, there are many choices available, many of which are excellent supplements to
What is hard to find is a tutorial that is fun, immersive, and gets you immediately
building cool things. Code Monster skips a lot of the syntax and explanation you
can get elsewhere (Google for it when you need it) and instead jumps straight into
the fun of what you can do if you learn to code.
Why doesn't this work perfectly on an iPad (or other mobile device)?
Code Monster will load on many mobile devices, might even be a bit playable
depending on your device, but it isn't designed for mobile. Why not?
Mostly because it is hard to type on mobile. Writing large amounts on a mobile
device is difficult, and it is even worse when what you are trying to write is code
and you need to keep looking at other parts of the code. Trying to write
large amounts of traditional code on a mobile device is not a good experience.
In part because of that, no one seems to have created a great app yet for learning to code on
mobile, but there are good apps out there that teach programming
concepts (such as Hopscotch, Move the Turtle, and Cargo-bot).
Can I use Code Monster offline (when not connected to the internet)?
Sure! Code Monster only uses the internet at the very
beginning, to load the website, and then never contacts the
So, for example, you can load Code Monster on a
laptop, then go on an airplane or walk to a park where there is
no internet connection, open your laptop there, and use Code
Monster without the internet. It even still saves your place so
you get back to the same lesson when you return! You don’t need
an internet connection except at the very beginning
when the website loads.
Code Monster from Crunchzilla is a website provided by Geeky Ventures.
In order to use the Site, you must accept the terms set forth below.
If you are a minor, your parent or guardian must accept the terms and
full responsibility for your use of the website. THESE TERMS OF
SERVICE CONSTITUTE A BINDING LEGAL AGREEMENT BETWEEN YOU AND GEEKY
VENTURES. BY USING THE WEBSITE, YOU AGREE TO THESE TERMS.
The website HTML, text, images, audio, video, software or other
content that is made available on this website are the property of
Geeky Ventures or its content suppliers. Before you use this content
in some way please take care to ensure that you have the relevant
rights and permissions. You are welcome to display on your computer,
download, and print pages from this website for personal and educational
THE WEBSITE IS PROVIDED "AS IS". Your use of this website is at your
own risk. Geeky Ventures disclaims all warranties, expressed or
implied, including without limitation, warranties of merchantability
and fitness of a particular purpose. Geeky Ventures disclaims
liability for any direct, indirect, incidental, special,
consequential, exemplary, punitive or other damages, or lost profits,
that may result directly or indirectly from the use of the
website. This includes, without limitation, any damage to computer
systems, hardware or software, loss of data, or any other performance
failures, any errors, bugs, viruses or other defects that result from,
or are associated with the use of this website.
Geeky Ventures may modify this agreement at any time, and such
modifications shall be effective immediately.
Code Monster is extremely protective of privacy. Code Monster
keeps almost no information about people who use the website.
Code Monster does not require registration. It does not have
your e-mail address. It does not know who you are. When you
use Code Monster, you are essentially anonymous.
come back, there is a feature that will get you back to the
using HTML5 Local Storage, which stores data on your machine,
not remotely on the webservers. Code Monster does not even know
what lesson you were on or how many lessons people using Code
Monster have completed, and it is a bit of a shame that we do
not, but that is how seriously we take privacy.
Like nearly all websites, Code Monster has web server logs that
may contain the IP address used to access the web server. That
is standard in nearly all webservers and not an attempt at data
In keeping with standard language in privacy policies,
personally identifiable information will not be disclosed to a
third party unless required by law and we may update this policy
from time to time at our sole discretion.
We are very protective of your privacy. We like it that way.
Code Monster can be reached at firstname.lastname@example.org
Code Monster would love to hear your suggestions for how he can
teach better. Code Monster no like complaints, but you can send
them to Code Monster too, and he'll eat them up -- yum, yum! -- with
his big nasty pointy teeth.
Code Monster from Crunchzilla is a product of Geeky Ventures.
Geeky Ventures is based in Seattle, WA.
Old Browser Warning
Oh my. Code Monster no like your web browser. Your browser
old. You need new browser.
Code Monster like Chrome
and Firefox. You can
play with Code Monster with those. Go get 'em and let's play!
If you want to try to use Code Monster anyway, go ahead and try, but
Code Monster probably no come out to play. Your web browser
scary. Me no likey.