Koppie, koppie! (1980)

The aim of the game is to guess which numbers the opponent is hiding after each picture. The winner is the player who succeeds in the least number of rounds.

After each round, the opponent announces "higher" or "lower" for each guess.

Each player has eight picture cards in a stand. Each of them is marked with a number chit. One player starts to ask questions, trying to find out how many of a picture the other player has (i.e., do you have five XY?). The answer is "yes", "more" or "less". The asking player then marks the answer on his/her stand (there are levers for that). The winner is the player who needs less turns to find out the opponent's setup.

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