Items Authored by Robert Abbott
Ultima
. Robert Abbott's Ultima page. By Robert Abbott.
Ultima Problem #3. The 3rd in a series of Ultima puzzles. By Robert Abbott.
Ultima Problem #9. The 9th in a series of Ultima puzzles. By Robert Abbott.
Abbott's New Card Games (book information). Information on a book describing Ultima, and eight card games. By Robert Abbott.
Abbott, Robert
. Logic Mazes: Website of Robert Abbott. Author: Robert Abbott.