I got a cartridge for the English version of "Digimon 2001" by "BBD" not too long ago and saw that the label says "by oneself play". I did a little digging and saw that someone was selling what appears to be "Mark of the Wolves" by "BBD" with the same "by oneself play" sign. It was a bit harder to tell on that one though, since the seller took the picture with really bad resolution. When I load "Digimon 2001" it boots with a "BBD" logo and the cart looks like it predates any dump of the game, so I think that these "oneself play" guys must have had some sort of contact with "BBD" (oneself play is probably just an alias for "BBD"). I was wondering if anyone else here has seen carts with this same sign. So far I have only seen "BBD" games with it, but it seems possible to me that these guys may have released other games in these carts. I'll include pictures of the carts I mentioned previously.