Hmm, "You must build off of words you've played yourself (the dark tiles on the board) after your first turn."

So if I put my first word cleverly in one of the denser places of the board, I am basically screwed (well, only until I start a new game)? Just disappointing after I searched the board for quite a while to place my second word, only to get that message. Also, I have no idea where to find my first word (I know it will appear darker, but I have no idea where in the 2D space.