Look weird at all? or am I just retarded? A I the first one to notice this? Gametype is sandbox... but it has the forge icon...? click to make larger. If you look at this link and go to files you can see all the pictures taken in sandbox on ghost town. Bungie.net : Bungie Online : Halo 3 Game Details
I've seen this before and I don't think anyone can really explain it yet. I guess it comes up as Sandbox sometimes when you're forging.
Im fairly sure its when you edit the forge options for fun, like making people invisible whilst in monitor mode. If that wasn't the case then I'd be like "OMG you has hawk eyes lol" cause i wouldn't have spotted that anyway.
Forge was originally intended to be called Sandbox but Bungie changed the name late into the development phase so occasionaly you'll see this. It's been around for ages, it's been on Bungie.net as well. Search bar, research, they're there for a purpose.
I can't believe it's taking people so long to notice this. I remember having "sandbox" games within the first week of Halo 3 being released, but yeah Squidhands is right.
i looked at my first 25 games a while ago and the first forge games i ever played were entitled Sandbox! ill try to get a screenshot of them but i will have to look through 6000 games!
People, the mystery has already be solved.. quite some time ago. And as for Paper's comment, it shows the Forge symbol, therefore it cannot be a custom game.