I've played all 4 rooms at Mission, and have been astounded by the quality! The rooms are fun, excellently themed and true to the suggested difficulty. My favourites have been Dr. M and the lost mine, but difficult to compare as they're all extremely different.
Definitely worth a play, and without a doubt the best use of space and immersion of any of the games I've played before (particularly The lost mine) you really feel transported into the them.
The only negative is that I can't do any more games here!