Word Square - Sudoku, but with letters and words.
wooord - Every day we have a new wooord for you.
SudoKoi - Your next favorite pastime, like Sudoku
isowords - Word search on a vanishing cube
UsDoku - Play real-time multiplayer Sudoku.
Wordle - Guess the hidden word in 6 tries. A new puzzle is available each day. The official game.