Just match up anything for a win to get the ego boost. I think the level select will say 1/1 ego boosts collected so you probaby don't get anything extra for matching up those Duke Nukem logos. I tried to many times and could only get two out of three lined up in repeating patterns so it might not even be a real random slot machine.
White friend code = 0303 8977 2273 I'm hungry. Give me a chilli dog.