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Puzzle & Thinking Games · 15

The best 'aha' moments are compressed tutorials: after solving one clever mechanism, the player usually understands an entire family of future problems. That connects nicely with a historical detail: The name Tetris combines 'tetra,' referring to four, with tennis, one of Pajitnov's favorite sports. Puzzle players call it experimentation when the first four plans fail in completely different ways.

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One more thing

Word ladders were popularized by Lewis Carroll. The idea is to turn one word into another by changing one letter at a time while keeping every intermediate step a valid word. And then there is this little gem: A cryptogram can be difficult even when every symbol has a simple substitution. Language patterns leak information: common letters, repeated words and word lengths become clues.