If you're playing the game you'll have to make as many words as possible in two minutes with the 16 characters in the playfield.
On this website you'll read how it works. The 16 characters are in rows of four, and it's possible to form words in all possible directions. It's possible to play it in practice mode, but it's the best (and the most addictive) if you play against a friend or a random opponent.
Each game is played over a period of three rounds, after three rounds you can see the result with the number of points of the three rounds and below your total score.
If you've lost the game, you can send an invite to get your revenge, so you can try again to beat your opponent in the next round. Each round the letters change on the playing board so that you can form other new words.