A crossword is a word puzzle that usually takes the form of a square or a rectangular grid of white-and black-shaded squares. The game's goal is to fill the white squares with letters, forming words or phrases, by solving clues, which lead to the answers.
About Puzzle Baron The Puzzle Baron family of web sites has served millions and millions of puzzle enthusiasts since its inception in 2006. From jigsaw puzzles to acrostics, logic puzzles to drop quotes, patchwords to wordtwist and even sudoku and crossword puzzles, we run the gamut in word puzzles, printable puzzles and logic games.
The puzzle was launched in June 1999, by Ertl, marketed to puzzle enthusiasts and 500,000 copies were sold worldwide, with the game becoming a craze at one point. Eternity was the best-selling puzzle or game in the UK at its price-point of £35 in the month it was launched.
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Knights and knaves logic puzzles were made popular by the logician and mathematician Raymond Smullyan. See http://en.wikipedia.org/wiki/Knights_and_Knaves. Here we have a total of 382 puzzles which get progressively more difficult. They were generated by a computer program written by Zachary Ernst.
Common in logic puzzle magazines are derivatives of the logic grid puzzle called "table puzzles" that are deduced in the same manner as grid puzzles, but lack the grid either because a grid would be too large, or because some other visual aid is provided.
In cryptography, Merkle's puzzles is an early construction for a public-key cryptosystem, a protocol devised by Ralph Merkle in 1974 and published in 1978. It allows two parties to agree on a shared secret by exchanging messages, even if they have no secrets in common beforehand.
The Rubik's Revenge (aka the Master Cube) has 4x4x4 blocks, making it harder to solve than the original Rubik's Cube.This puzzle was released in 1981 and was actually invented not by professor Rubik himself but by Péter Sebestény. The most common algorithm for solving the Rubik's Revenge is called the "reduction" method.