Developer ships unwinnable game level after bug silently skips victory condition

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A developer released a wilderness survival game with eight scenarios, only to discover that the hardest paid level was impossible to complete due to a silent code bug. The flaw lay in a timing conflict between two functions: travel() marked hidden locations as discovered before the player arrived, causing arrive() to skip first-visit effects entirely — including the win condition. As a result, reaching the game's designated victory tile in the highland_mine scenario produced no outcome, leaving players stranded in what the game internally recognised as the finish line. All existing validation tests passed because they checked structural correctness — whether locations existed and were reachable — rather than simulating actual gameplay execution. The developer ultimately fixed the bug by reassigning location discovery solely to arrive(), and built a dedicated playthrough harness to catch similar execution-level failures in future.

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