Multipop Word is another good game from East of the Web. It’s sort of an online word search puzzle where you need to find words. You can use any letter as long as they are next to each other in one way or another.
What makes this game stand-out, though, from other online word games is that everyone who is online at the same time competes against each other using the same puzzle, and high scores are published immediately after the game.
Intermediate and Advanced English Language Learners might find this game enjoyable.
I’ve placed in on my Intermediate English page under Word Games.