Players take turns forming words on either an 8x8 (original and Winning Moves "new classic" versions) or a 10x10 (most later versions) grid. Words may be formed horizontally or vertically, as in Scrabble, but, as the title suggests, the letters may also be stacked. This allows already played words to change into different words by stacking new letters (up to a limit of 5 high). Perfect for traveling or on the go, as it comes with a travel case!
For ages 8 and up