River crossing puzzle

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A river crossing puzzle is a certain type of transport puzzle where the object is to get items from one river bank to another while certain rules apply. The most typical ones are the river IQ test, fox, goose and bag of beans puzzle and the missionaries and cannibals problem. While they initially may seem identical, they are not. In the first one no certain items, such as the fox and the goose, may be together alone in one side of the river. In the latter, there are only two types of transportable items, missionaries and cannibals, but there may not be more cannibals than missionaries in one side.

Other variants may include weight limits, speed limits or both. A cosmetic change is that the setting may also be different, for example a bridge, but the basic logic stays.