A CUBEWORD set consists of 25 cubes. 24 are letter-cubes, displaying a letter on each of five faces; the sixth face is blank and may be named to represent any given letter. One is a numbered die, used as a named any-letter Joker in the basic game. It has other roles in later CUBEWORD variants.
CUBEWORD can be played by any number of players from one (solo play) to six. No board is required: any surface of about A4 size will serve. The aim is to score points by forming words which intersect across and down, as in a crossword. Letters which do not form words may not lie next to one another.
Words which are disallowed are: those beginning with a capital letter; words which require hyphens or apostrophes; abbreviations; foreign words not adopted into English.
Players take turns, each consisting of up to five moves (as many or as few as they wish ― none, if they so choose), to select, place, move and rotate cubes. One move may be used to :-
Site a cube, by selecting it from the pool and placing it with the chosen
letter (or a named blank face) upward;
Re-site a cube already in play by moving it (without a change of face)
to a new position;
Re-face a cube already in play (without a change of site) by turning it
over to show a new letter or a named blank;
Re-name a blank face, or the Joker (without a change of site) to
designate another letter.
Two moves are required to re-site and re-face, or to re-site and re-name, any letter cube. But, with the Joker, two such combined moves count as one.
Blanks are named as a chosen letter when they are first sited and retain that designation until they are re-faced or re-named. No more than eight blanks may be in play at any time.