Ultracode is a 2D barcode in color: each square is one of eight colors, so it holds more in less space than black and white. It needs a color printer, and few scanners read it - check yours before you print a batch.

What it holds
Characters	Letters, digits and symbols, and the accented letters of Western European languages - é, ü, ñ and the like. The euro sign, other alphabets and emoji don't fit: use a QR Code for those.
Length	Up to about 250 characters, with Automatic error correction. More error correction holds less.
Error correction	Automatic error correction, or EC0 to EC5.
Readable text	None.

Settings
Error correction	EC0 only detects damage, it doesn't repair it; EC1 to EC5 repair more and more of it. Automatic error correction is EC2.
Encoding	Standard or GS1: see GS1 and HIBC data.

Ultracode is printed in its own colors, so there's no Pen for it. Labeljoy makes the first revision of the standard, revision 1.

Characters you can't type. With Encoding set to Standard, a tilde followed by three digits is the character with that code - ~013 is a carriage return - and ~~ is a tilde.

The rest of the settings - quiet zone, padding - are in the Barcode section.

What goes wrong
Data too long for selected error correction capacity.	The value doesn't fit an Ultracode with that Error correction: choose a lower one, or shorten the value.
Only Latin-1 characters, the letters of Western European languages, fit in this barcode.	The value has a character Ultracode can't hold - a euro sign, another alphabet, an emoji.