The best thing to do is to do the game on hard to unlock superhuman. then whatever you miss in hard you can get in superhuman and whatever you miss the you can goo back to location select and do whatever area you missed things from on easy. the first time i completed the game it was on hard which took about 4-5 hours that i spead over 2 days then it took me 5-6 hours over 3 days to complete so i got the suit.