A 5th and 6th level for the sound memory activity would be fun.
More levels would just be more of the same or do you have an idea how theses levels would differ from the existing levels?
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Well, the idea would be to join 2 levels with higher difficulty (more pairs to find). In other memory activities (numbers, pictures) there often was a differentiation of users in higher levels only, because the lower levels are (too) easy for everyone, the capable and the impaired users in the same way. In level 1 almost always "time" decides about the score, because it does not demand much mnestic function. In higher levels there is a real need for memorisation and there are visible differences between users.
Ok, more pairs that wouldn't be to hard to do.
I must confess I don't remember what the reason for a limited number of levels was.
I will add it to the to do list.