This is similar to a crosword but with numbers instead of words. There are two types of entries: horizontal (across) and vertical (down), and each entry is provided with a clue. To solve a puzzle you need to find consistent answers to all its clues.

The application provides various customised features, shuch as size of puzzle, categories of clues (anagrams, arithmetic explressions, table values, etc), and others.

XFig is designed to suit any device running PalmOS 3.5+ and is PalmOS 5 compatible. Colour screen is a substantial advantage, though not necessary.