The object of the game is simple: guess the missing words. Words along the same edge are connected in some sense. They might be synonyms in a certain light, antonyms, or they may share a less conventional connection. Double click missing words to reveal one letter. Click hint buttons to reveal word relationships. Note: using hints reduces your score.
What makes the game interesting, I hope, are the two phrases you end up with on the top and bottom of the square, and how the constituent words have relationships even though the phrases themselves may have nothing to do with one another.
This idea has been better explained elsewhere. Particularly here. I didn't come up with the idea, but I found it so compelling that I made this.
Hopefully you find this at least a little amusing. Give it a shot.