The letters stacked in each column are meaningless...until you move them into the boxes directly above. Place them correctly and you'll reveal a message. If you place them incorrectly, congratulations! You've just wasted a whole bunch of time replacing gibberish with more gibberish.
Let's start with one you could figure out in your sleep. Click and drag a letter from a column below the blue line to an open space above it. Move all letters into place to create a sentence or phrase. When you're done placing letters click the 'Check It!' button. If you simply cannot figure it out, press the 'I Give Up!" button. Easy enough, right?
Choose a level of gameplay. The higher the number, the bigger the puzzle!