for me i think it would be the gameboy player for the gamecube. whoever thought of it deserves a medal for thinking of it. becouse of it you could play physical copies of any game in the gameboy family on the big screen. i wish nintendo would do the same thing with the wii u and 3ds. (NO MORE EXPENSIVE CAPTURE CARDS!!!! ) what do you think is the best add-on? are you gonna go for the gameboy player too or the broadband adapter for the dreamcast? or are you the kinda person who likes the Sega CD and 32x?

Okay, it's not that cool, but I have a lot of memories of it, okay?

I didn't get many add-ons.  Don't think I got any.  If it took off I would have said the N64 64DD, cause we would have got an extended OoT and all.  

My fav is the paintbrush add on to the Wii for Epic Mickey.

I think Majora's Mask was the best add on because even though it's not one, it was supposed to be an add-on of oot but it got scrapped for some reason.

 

The Gameboy attachments for the Nintendo systems.

Nintendo 64DD.

 

 

the world just wasn't ready