Dear Oracles,

I and a buddy are trying to play multiplayer with our RE1 DS games. However, no matter what we do we can't find each other through the game.

I have a 3DS and the original DS, he has the original DS. We tried every possible setup:
- 3DS hisDS.
- 3DS myDS.
- myDS hisDS.
- brother'sDS myDS.
- brother'sDS hisDS.
- brother'sDS 3DS.

We can find each other through the pictochat just fine on either of the DS's, so we know that the DS's can find each other and can communicate. But we still can't find each other through the game.

We have tried googling, but we can't find the solution to our specific problem. In fact, we can't find any mention of it anywhere.
The only possible explanation that we can think of is that my cartridge is US and his is European. However, DS games aren't region locked, and even if they were, multiplayer should be possible regardless of where the cartridge is from.

Anyone have any ideas\similar experiences?

(I won't be able to mark the right answer (if anyone can give it) until I meet up with my buddy again this summer.)

So basically, there's no way to make our games connect.
I'll mark your answer right. Thanks mate.