This is a freeware compilation for use with Handy, but permission is granted to anybody to buid, distribute and sell cartridges of the games.
You will find more informations on this freeware compilation here (including archive in order to play it with handy) :
http://fadest.free.fr/Yastuna2/indexen.html
and http://fadest.free.fr/Yastuna2 in french