Prototypes?

[Asprate]

I got these carts a few years ago in a big lot of games from Japan, I never thought anything of them then, but I noticed them now when going thru all my Famicom games.

Are they prototypes?

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[portnoyd]

They certainly look like they could be. What games on are on them?

[Jedi Master Baiter]

Prototype Wing of Madoola? How much you want?

[P]

Bottom right says Family Stadium ("famiriisutajiamu" in katakana).

[P]

There is a game called Family School, I almost thought that was the game you meant first.