Well its not really help. I'm a bit confuzzed. Are there only 4 Acts? Cos I started at the end of Act 4 and its switched to Metal gear solid 1 (I'm assuming, as the graphics are quite poor), it starts at a helipad. I dont remember seeing any end credits rolling. It has not unlocked The Boss Extreme mode either, like it says in the booklet.
Its a great game but i'll be somewhat a bit disappointed if thats it.