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Divide 3 groups first.
) `. c; n1 K4 si.e. 4 x 4 x 4.
) U" y: w& O& d6 FTVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。Weight any 2 groups [1st]
% ~  p2 I* m: R- W) ^tvb now,tvbnow,bttvbthen you will know the heavier ball in which group.
/ u! O$ ]8 R* f3 s0 ~$ a% Ntvb now,tvbnow,bttvbWeight any 2 balls in that group [2nd]TVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。; j, Z# T' j+ H5 t
then you will know the heavier ball in which 2 balls.
( n4 ^% ]% p- G( L* HRepeat again in remainders [3rd]
. g2 I# K1 I5 Ntvb now,tvbnow,bttvbGot the heavier ball.