The Chain Reaction (チェーンリアクション) is the first obstacle of the Second Stage from SASUKE 7 to SASUKE 17.

It consisted of two perpendicular zip-lines. Each zip-line has a chain hanging from it by a single point. Competitors must grasp the chain on the first zip-line, ride down a 9.5 meter-long track and switch to the next chain in midair. Once on the second chain, the competitors must kick off a wall to travel along the second track (7.5 meters long) to a landing platform at the end.

Competitors are required to wear gloves (for safety reasons) when holding the chains, which they must discard prior to reaching the Spider Walk. This particular rule came into play, when Yamada Katsumi forgot to take off his gloves during the Spider Walk in SASUKE 12 (see Yamada Katsumi's Glove Disqualification).

Starting in SASUKE 13, the producers used a new stained glass theme for the obstacle's kick-off wall. This theme was also on the background for the Downhill Jump, the obstacle that had replaced the Chain Reaction after Nagano Makoto's kanzenseiha in SASUKE 17.

Competitor's Success Rate

  • All results based on the TBS broadcast and external information found
SASUKE Clears Attempts Percentage
7 6 8 75%
8 5 6 83.33%
9 7 7 100%
10 5 5 100%
11 10 11 90.91%
12 12 12 100%
13 10 10 100%
14 13 14 92.85%
15 7 7 100%
16 16 16 100%
17 11 11 100%
Total 102 107 95.32%


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