A Sudoku Grid for Word Gamers Kotsuku is a grid-based game with an added competitive dimension as players vie to be the first to complete a word in the grid. Players take turns placing letters in the grid one letter at a time. Each letter in the alphabet may be used once per game. The object is to be the first person to complete a word of three or more letters. Words may be vertical, horizontal, diagonal either frontward or backwards. Use your letters wisely and be sure not to leave an opening for your opponent!