[quote name='eastx']Ah ha. Yes, it's exactly the same kind of game as Ikari Warriors, Guerilla War, Caliber 50, and of course Commando & Mercs.
Yes, you can beat the game on easy and then select stages on any difficulty, but you can't get the Achievements for beating it on the highest 2 difficulties that way. You have to start at the beginning of the game and play all the way through to get those 2.
BTW, if someone could please test whether beating it on the highest difficulty also gets you the Achievement for beating it on the next-highest difficulty, I'd appreciate it. Gotta put that in the guide.[/quote]
So when you unlock level select, can you go back and get the secret areas anytime to get the achievement or do you have to do it in one sit through?