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Bidirectional traversal observed
One-way traversal (solid = observed direction, faded red = not observed)
No traversal observed (likely a problem)
↑
Needs the developer: a new build (open issues on this build, or broken doors)
↻
Needs QA, retesting: a newer build may fix it (green) or likely not (red)
▶
Needs QA, testing: a first test, or more play
✓
OK (small number on any marker = open issues)