Pack 3 Character castles

Character castles is about square brackets. A class like [aeiou] matches one character from the set, a range like [a-m] covers a run of letters, and a caret inside, as in [^aeiou], flips it to everything except the set. Classes are how a pattern says “any one of these”.

You begin with words made only of vowels, like oui, then flip it to words with no vowels at all, so rhythm is caught and fish is spared. Later boards keep to the first half of the alphabet, catch any kind of bracket in text like f(x) or {key}, and catch numbers written only with 0, 1 and 2, like 2101.

Every level also has hidden checks: words you don’t see. Passing the words on screen solves a level; passing the hidden checks too ranks it.

Once classes feel easy, Quantifier quarry adds repetition. The Character classes track walks through ranges and escaping one step at a time.