The native names for these discs are like this
but right above 「４月号」on the box I have is the year 「２００６」,
so shouldn't it be like this
It's the same for every Gekkan Nintendo box I've seen a picture of.
(I've been using [U+3000] instead of the actual character as it is auto-deleted by the forum)
edit: on the side of the disc its「２００６[U+3000]月刊任天堂店頭デモ[U+3000]４月号」, so now I'm not so sure.
Able to dump: GC , Wii, Wii U | GBA, DS(i), 3DS