...oh, I see, you can put tiles on top of other tiles. That would have been a really good thing to know (didn't the tutorial stress they can only go in blank spaces?).
The other thing is that sometimes it won't let me play a tile at all if it doesn't make a word (hence my previous question about having to keep extending), but sometimes it does. When it does, it's much easier: get a five letter word, hang an "E" off the end that doesn't make a word, wait for an R or a D.
I feel like there's definitely something good here, but it could use more clarity.