I think you'd get many more plays if there were no yellow boxes. It is a bit too challenging in a tedious way as is. It is a very good concept though and I'll be looking forward to trying this out fully with the recommended changes.
Without the yellow boxes you just have to guess all the token overseas territories and walk away with a high score. I like the extra challenge of actually having to guess each flag individually (even if the British overseas territories are very hard to see).