Solitaire Morpion (5T)

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Solitaire Morpion (5T) is a one-player game where you extend a pattern of dots by adding lines made of five connected dots (horizontal, vertical, or diagonal). Each move must add exactly one new dot and cannot reuse any previously drawn segment of a line. The goal is to add as many lines as possible without breaking the rules. It first appeared in France in the 1970s. The world record is 178 lines.