Igi is, like most cats, very curious and therefore he can't stand closed doors. If you really don't want to have him in a room, for example your bedroom, stay firm and don't let him in. He might protest to this by miauing, but he usually gives up after a short time.
Please make sure he can always access the kitchen as his food, water and the cat-door onto the terrace, where his toilet is, are there.
Igi LOVES the smell of olives and dried pepper, it makes him go a little gaga! :) Be careful if olives are on the kitchen table as he might try to get to them!