Free Word Square Game for Android
They then take turns in naming a letter. As each letter is named each player must write it immediately into one of the cells in their grid. Players can choose any letter they like, and letters can be repeated.
When the grid is full the players count up the number of four-letter words they have made, reading across, down, or diagonally, and the one with the highest score (out of a possible 10) wins.
One interesting aspect of the game is that you can either choose letters that help you complete words, or you can try to thwart your opponent's word