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I've read that QRCODES has about 4,290 alphanumeric chars limit (about 4kb).
Is it true and is there any way to increase their memory size?
I would like to have more space on if possible: P
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What can be stored in a QR Code? Up to 7089 digits or 4296 characters, including punctuation marks and special characters, can be entered in one Code. In addition to numbers and characters, words and phrases (e.g. Internet addresses) can be encoded as well.
A Definition of 2D Barcodes because they store information horizontally and vertically; in fact, 2D barcodes can store up to 7,089 characters, which is a much greater storage capacity than the 20-character capacity of standard barcodes.
A QR Code can store up to 4296 characters or 7089 digits in a single code making it viable to hold large amounts of content.
A summary of the specification is here:
* http://en.wikipedia.org/wiki/QR_code Numeric only Max. 7,089 characters (0, 1, 2, 3, 4, 5, 6, 7, 8, 9) Alphanumeric Max. 4,296 characters (0–9, A–Z [upper-case only], space, $, %, *, +, -, ., /, :) Binary/byte Max. 2,953 characters (8-bit bytes) (23624 bits) Kanji/Kana Max. 1,817 characters The specification itself is here:
As far as "more space", you should think of the QR code as a "link", or a "shortcut" to your URL. Clicking the QR code brings the user to web site; once they're there, you have as much space as you want.
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QR codes come in various standardized sizes, but the largest is version 40 which can store about 2,953 bytes. 2953 character is the maximum that you can store within a single QR code
Mattkc has a video on youtube, where he stores the snake game within a QR code. It's quite awesome check it out.
https://mattkc.com/etc/snakeqr/ 
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