Normally when a DS is closed and a game is on, the DS goes into sleep mode, but if you're playing music from the music player in Advance Wars: Days of Ruin AND you have headphones (or something like an Aux Cable) plugged in to the headphone port, the DS will stay on and continue to play what you're listening to.
Eh, it's not really a big find, I vaguely remember some other games doing that, as well as the 3DS.
Not really groundbreaking, but it's news to me so I now know something new
I love in SM64 DS when you closed it. Mario would say "goodbye".
So far that's the only DS game that I know that keeps doing something when closed. New Super Mario Bros. and SM64 DS both do the "Goodbye" thing when you close it, but they're still on sleep mode when closed, while AW:DoR stays running, until you unplug the headphones. So there are other DS games that keep doing something when closed? I tried doing the same with music players from Fire Emblem (being that it's also from Intelligent Systems) and from Castlevania: Order of Ecclesia, but they go to sleep mode anyway. Does anyone have AW: Dual Strike to test this out?