Knave Ballbust Link Site

She took one step closer. Rigo’s bravado held—for about half a second. Then her steel-toed boot swung in a low, precise arc.

One well-known mechanical puzzle that fits the description of having solid pieces and could be related to what you're asking about is the "Sliding Knave" or more commonly, puzzles like the "15 Puzzle" or "Knave Puzzle." However, without more specific details, it's challenging to provide a precise answer. knave ballbust