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If by "hacked" you accept "flash carts", then it appears to be hacked: http://www.r43ds.com/ (and a few other brands)

edit: ah, nevermind, see other comments.

You sure? I could swear a friend of mine had something at least a year ago that allowed him to play just about anything he wanted on it. Maybe that was the older DS?

The DS stuff still works in DS mode, though they periodically make firmware releases that try to lock them out. Nothing executes in 3DS mode, though.

http://gbatemp.net/threads/nothing-plays-3ds-roms-3ds-still-...

There are a range of carts.

These carts play DS games, they do not play 3DS games.

Each time the console gets an upgrade (DS to DSi; DSxl; 3DS; etc) some of the carts stop working, and manufacturers use it as a marketing opportunity.

Cards usually tack '3ds' on the name. EG: "R4i3DS". But these just play DS games on the 3DS. (Some of them include GBA emulation functionality; nothing could play GBA games on the NDS cart slot until recently.)

there are sd carts that allow you to play ds games on 3ds, that is as far as they have gone