The game is based on a famous puzzle called Einstein's Riddle, which is also known as the "Zebra Puzzle". It is said that only 2% of the population is able to solve this puzzle.

The rules of the game are very simple. You have to identify the house that has the zebra, or the fish. The houses are all in the same neighborhood.

To play the game, you have to open the app, and then tap on the puzzle. You will be presented with a board with five houses and a list of clues. You will be asked to make a choice. You can tap on a house to see if it is the one you are looking for.