Thank you for keeping us on our toes!
Generally we try to avoid words with ambiguous spelling e.g. (COLOR vs. COLOUR) if we do use a word with ambiguous spelling, we tend to go with the American version. (Most Bonza players are based in the USA)
If a particular puzzle is localised then we sometimes use the local spelling e.g. (SYDNEY HARBOUR vs. SYDNEY HARBOR). The English language is fluid and always open to interpretation, we embrace this.
If you've found an error, please let us know. Send an email to firstname.lastname@example.org and we will fix it as soon as possible.