In Huggy Wuggy Merge, you have to combine two of the same kind of tiles to make a bigger one with twice as many pieces.
You use the mouse to drop tiles with Huggy Wuggy's face on one of the four spots. As you drop them, try to merge two tiles with the same number into one, which will make a tile with a higher number.
Keep doing this to get more points, but don't stack up the wrong tiles so much that they reach the top of the screen, or you'll lose.
Have fun and good luck!