My experience comes very limited in this game, whilst having played a lot I have only done maybe 15-20 of the missions and about 7 i can remember, this is mainly due to the fact i used this game to connect with a few of my friends from high school at the time they were obsessed, I always found it kinda fun and i find a lot of the progression and missions are there for new and experienced players a like. It is a simple idea with multiple options to take missions but can become overwhelming quickly when you get caught and then have invisble ninjas flying at your face.