Solving 5 levels is already very impressive,the game is a very complex. Level 5 is intended to be solved in 4 loops(since the spike path a button in the end nolonger work because health kit). Level6 requires to to notice that a button is pressed when there is a dead body on it, and it can be solve in 3 loops. Level 7 is really long, Level 8 is just a nightmare.