Word Jam

The aim of the game is to form words by moving letter tiles within the game board.
Words may be formed horizontally or vertically.
Words must be formed of tiles of the same colour.
Different board sizes may be chosen.
Words must meet the chosen requirement for the minimum number of letters.
Individual tiles may be moved unlimited times, or may be limited to a maximum number of moves.
Games may be limited to a set time or have an unlimited duration.
Both British and American English words are permitted.