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In the routine below the variable 'sqr' stays 0 for all iterations. Only when I deleted the comma ("for (sqr piece) $space;") it runs through the square labels. Yet the GAME code manual suggest a comma should be present.

The Developer's Guide was wrong. I have corrected it. It uses spaces as separators, and when I used a comma, it added the comma to the variable name, so that this code worked:

foreach (key, var) spaces:
  echo #key, #var;
next;

But this code did not:

foreach (key, var) spaces:
  echo #key #var;
next;

(And thanks for fixing the dash problem; I would never have found that.)

It's important to remember that it was a minus sign, not a dash. When you use the # prefix before a variable name, it rewrites your code by replacing your variable with its value. Because it rewrote your code with a minus sign, your line of code was now trying to do subtraction. This threw a monkey wrench into your code in a way that a mere dash – which would be a meaningless string that was wider than a minus sign – would not have. Inserting the value of variables in this way is mainly intended for using variables with commands that do not process expressions (at all or for a certain argument). Within expressions, it is usually safer to use the var operator, which simply returns the variable value without rewriting your code. I believe functions are now an exception to this, since the following code prints 13, not 17:

set a 8;
def test + 9 #a;
set a 4;
print fn test;