ters ▁The ▁first ▁round ▁was ▁entitled ▁Ch ain ▁Let ters ▁( Make ▁a ▁Ch ain ▁in ▁the ▁final ▁series ). ▁Each ▁contest ant ▁chose ▁one ▁of ▁four ▁hidden ▁four - letter ▁words ▁and ▁had ▁ 4 5 ▁seconds ▁to ▁create ▁as ▁long ▁a ▁chain ▁as ▁possible ▁by ▁changing ▁one ▁letter ▁at ▁a ▁time . ▁Pro per ▁n oun s ▁and ▁pl ur als ▁were ▁not ▁allowed , ▁and ▁the ▁contest ant ▁could ▁not ▁change ▁the ▁same ▁letter ▁position ▁on ▁consecutive ▁plays . ▁( E . g . ▁SA LE ▁to ▁MA LE ▁to ▁M I LE ▁was ▁allowed , ▁but ▁SA LE ▁to ▁MA LE ▁to ▁T A LE ▁was ▁not .) ▁▁ ▁Each ▁valid ▁word ▁added ▁£ 5 ▁to ▁the ▁contest ant ' s ▁score . ▁W ords ▁had ▁to ▁appear ▁in ▁the ▁Long man ▁Dictionary ▁of ▁the ▁English ▁Language ▁( Ch amb ers ▁English ▁Dictionary ▁in ▁later ▁series ) ▁in ▁order ▁to ▁be ▁valid . ▁At ▁each ▁step , ▁the ▁contest ant ▁had ▁to ▁call ▁out ▁both ▁the ▁letter ▁being ▁changed ▁and ▁its ▁replacement , ▁then ▁say ▁and ▁spell ▁the ▁new ▁word . ▁If ▁a ▁word ▁was ▁invalid , ▁the ▁letter ▁change ▁was ▁und one . ▁ ▁Round ▁ 2 ▁– ▁Bo oby ▁T rap ▁Cont est ants ▁played ▁in ▁desc ending ▁order ▁of ▁their ▁scores ▁from ▁Round ▁ 1 . ▁The ▁contest ant ▁in ▁control ▁chose ▁one ▁four - letter ▁word ▁from ▁a ▁group ▁of ▁four , ▁then ▁selected ▁one ▁letter ▁to ▁change . ▁Both ▁oppon ents ▁then ▁secret ly