Real Einstein's Riddle

Real Einstein's Riddle is a puzzle game, based on a logic puzzle called "Zebra Puzzle" or "Einstein's Puzzle". The puzzle involves multiple persons -- each of which has a different occupation, likes a different drink, owns a different pet, etc. -- and the player must figure out all the characteristics of all the individuals. To help in this, the player is given a set of clues such as "The painter drinks Coffee" or "The Englishman isn't named Louis". There are four difficulty levels, each with a different number of people and their traits. Each difficulty level contains 80 puzzles.

During the gameplay, a table is shown with each column corresponding to a particular person's traits, and each cell containing several icons that represent possible choices. The player can turn the icons on and off to narrow down a person's given trait, eventually choosing one right option once he is sure of his choice. Hints can be read one-by-one, but the player can also "shelve" a hint he no longer needs to keep it from showing up, and can use a "filter" option to only view the hints that mention specific characteristics.

The game contains ad banners that can be turned off for a fee.