Waagemut

This is a children/family game in the 80s from Germany, known as 'Waagemut'.

Up to 4 players with different colors drop weights into slots.
Each player starts with 8 weights.
Weights can be put on top of each other.
If the construction tilts, the responsible player has to remove her weight and drop it back into the box.
The game is over when all players have placed their weights.

Point counting: weight on first slot equals 1 point, second slot 2 points and so on.
There are many alternative rules around, most challenging is probably:
The player on top gets all points of this slot (the colors/players below loose their points).

Even though this game is very intuitive and easy to understand for children age 7+, it has some physical/mathematical properties which make it interesting for adults also.

I've added a small commandline C++ program which can calculate the next possible move, for the nerds of you.