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I appreciate your query, but I need to clarify an important limitation: the search results provided do not contain sufficient information to fulfill this request comprehensively.
The search results focus specifically on the **Sydney Harbour Bridge** and its walking/climbing experiences, but your query uses non-standard terminology ("chain-bridge-walks" and the hyphenated descriptor "3-km-steel-arch-pylon-climb-or-base-to-pylon-walk-with-opera-house-panorama-urban-thrill-minus-gorge-drops") that doesn't correspond to standard travel nomenclature or established experiences documented in the search results.
**What the search results do contain:** The Sydney Harbour Bridge offers three primary experiences:[1][2][3][4][5][6]
1. **BridgeClimb** – A guided 3.5-hour ascent of 1,332 steps reaching 134 meters, with 360-degree views[6] 2. **Pylon Lookout** – A self-guided climb of approximately 200 steps to the southeast pylon, accessible via the pedestrian walkway, costing $15–$30[2][5] 3. **Free pedestrian crossing** – A 2.5-km walk across the bridge's eastern walkway without charge[4]
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