I registered an account on this forum just to post about this.
I got this game. And the security level is an absolute pain in the a**!
I could scream in frustration over it.
They definitely screwed up in trying to make a stealth level. They should have at least paid some attention to Metal Gear Solid's setup, if nothing else they could have put the guard's positions on the mini-map, maybe even a vision cone.
I got the game to have Yugioh duels, not play at stealth or motocross. But I guess some people enjoy that with their Yugioh.
Anyways, there was a code listed, the one where you Hold R to stealth through this part.
It would not work one bit. However! I glimpsed somewhere, in my frenzied search of the net, about another code that didn't work while another code was active.
So I turned all of my codes off. I had the Max DP, Press Start for 9999 LP, and a few others.
I turned on this code, and ran it by itself. And it worked perfectly.
It's actually a walk through walls code, for those of you interested. I noticed this on the lower right level, where you start the timer. When you exit the room, if you hold R and race to the left to exit the hall, while you are holding R you will run completely off the map, you won't trigger the area transition.
So you need to let R go when you get to the end of a hallway, to make it through the transition.
But you can run right up in front of the guards and they won't do a thing. It works like a charm

Thanks for porting this to the NA version.