Drop7 vs 15 Puzzle
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Drop7
Dropping numbered discs into a seven-column grid creates Drop7's compact numerical puzzle. Created by Area/Code and first released for iPhone in 2009, the game removes a disc when its number matches the length of a contiguous group containing it horizontally or vertically. Because removals alter the arrangement, a single placement can trigger a chain reaction that changes much of the board.
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15 Puzzle
The 15 Puzzle is a sliding-tile puzzle consisting of fifteen numbered square tiles arranged in a four-by-four frame with one empty space. Players move adjacent tiles into the gap to restore a specified numerical order, and only half of all apparent arrangements are mathematically reachable from any given starting position. The puzzle became an international craze around 1880 and remains a standard...
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