Shouldn't there be some resistors here?
Also, the buttons; aren't we promoting ground to buttons and internal pullups?
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There should be a MAX7219 there! 
Most certainly, but I think the point of the tutorial was to also teach the use of map and using arrays with pinmode and digitalwrite.
What buttons?
My mistake, old eyes. I see now that those are potentiometers.
Previously reported here:
Thanks, feel free to delete this question as extraneous, if appropriate.
No no, that was not my intention. I only wanted to cross-reference to additional information about the documentation defect in case it might be of value to the interested parties.
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const int row[8] = {
2, 7, 19, 5, 13, 18, 12, 16
};
// 2-dimensional array of column pin numbers:
const int col[8] = {
6, 11, 10, 3, 17, 4, 8, 9
};
// 2-dimensional array of pixels:
int pixels[8][8];
We should also be promoting appropriate datatypes 
Almost 3 years old. Seems like Arduino would benefit from hiring someone to go through their tutorials and keep them from destroying equipment.
They have hired us. But we don't know 
The hours are OK, but the pay and benefits suck.
Didn't you get the 200% pay rise?
I may have but how does one tell since 0 x 2 = 0?
Raise it to 0 first
All those 
s are worth their weight in gold though.
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