From the box:
Auditective
Play with sounds
In this new, innovative "lotto" game, you will explore a whole world of sounds, some familiar and some not so familiar. By playing Auditective, you will soon be able to identify the fine distinctions that differentiate more than 50 sounds from one another.
At home or while traveling, both children and adults can discover their soundscape while playing together.
End quote from box.
This game comes with a CD of various sounds of a wide variety of musical instruments, two identical decks of 50 cards picturing different musical instruments, and a sheet with rules for six game and pictures and a brief description of 50 musical instruments.
The "rules" of the games are more like suggestions. Players are encouraged to create their own games with their own rules.