I am happy that this can be achieved and would thank erdelf and danpost for their immediate response but may I be more specific. The subclass of World is called Reckon3. I have now defined the array in Reckon3 thus : public int grid = new int ; How would the code look in 'Marker' which is my subclass of Actor. To see it written in this way is the only way this befuddled old brain will understand it. Thank you once again.

