The best of the 3 titles
This one is probably the most fun out of the three Royal Envoy titles, though the only niggle I have is it's the only one that doesn't provide bonus levels at the end once you've completed the adventure. The other two titles have 30 bonus levels to play each, which in my mind is great value and very deserving of the title collector's edition, which lets face it is getting used left right and centre whilst providing very little for paying the extra for the edition.
All that aside, I would highly recommend any of the three Royal Envoys, they're fun to play, have a good level of challenge without being so ridiculously hard that you'd rather go and watch some paint dry than try and figure out how to carry on. And they're replayable. Great value all round.