Comment by DamnInteresting

> Dropping one tile on another should swap their positions.

This seems to be a common sentiment, so I plan to implement it. Thanks!

> It shouldn't be possible to drop tiles on the grid outside of the word boundaries

I've heard mixed opinions on this one. About 2/3 of people who have commented on it say that they like that the tiles can be dropped in the outside space, so they can rearrange and sort. About 1/3 dislike it (among those who say anything about it). But it's not a very large sample size, so I'll need to seek further feedback.