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Divide 3 groups first.
) Y& J' m1 n4 @i.e. 4 x 4 x 4.
$ ^2 W" `2 ]4 L3 h3 G公仔箱論壇Weight any 2 groups [1st]
0 w1 c+ U6 ~& S* {1 N6 VTVBNOW 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。then you will know the heavier ball in which group.
8 Q( k' l2 z; b. ]$ i5.39.217.76Weight any 2 balls in that group [2nd]
2 p. O* p9 m: N1 }- @then you will know the heavier ball in which 2 balls.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。  q6 @" Z( \0 x4 A$ R3 S0 A
Repeat again in remainders [3rd]
( R) M8 g% O4 V- _公仔箱論壇Got the heavier ball.