(Superchain) In Catherwood's endgame, the winning team had 45 seconds to guess seven more words. To start, a keyword was given, the seven words involved connect to that word. Then on each word, the first three letters were given one at a time. A correct answer moved on to the next word. The team could pass on a word if they were stuck and then must go back to it if there was time left on the clock. Guessing all seven words correctly won $5,000. 2021 (Three Final Chains) The 2021 version's bonus round is a timed variation of the main game, in which the winning team must complete three final chains—of four, five, and six words, in that order—within 60 seconds. In turn, each player calls for a letter below the top word or above the bottom word, and then attempts to guess that word; control then passes to the next player, whether the guess is correct or not. The clock stops when each chain is completed. A team that completes all three chains (nine words total) in time wins an additional $10,000. International versions * Aired in both the U.S. and Canada for both audiences/players.** Edwards filled in for two weeks while Cullen was filling in for an ill Allen Ludden on Password Plus. References External links Chain Reaction (1980)/(1986–1991) on IMDb Chain Reaction (2006) on IMDb Chain Reaction (2015) on IMDb Chain Reaction at Embassy Row 1980 American television series debuts 1980 American television series endings 1980s American game shows 1986 American television series debuts 1990s American game shows 1991 American television series endings 2000s American game shows 2006 American television series debuts 2007 American television series endings 2010s American game shows 2015 American television series debuts 2016 American television series endings 2020s American game shows 2021 American television series debuts English-language television shows Game Show Network original programming NBC original programming Television series by Bob Stewart Productions Television series by Embassy Row (production company) Television series by Sony Pictures Television Television shows filmed in Montreal American television series revived after cancellation USA Network original programming