8 Figurines
You have eight figurines, all exactly identical in shape, color, texture,
etc except for one which is slightly different in weight. You also have a
two-sided scale. What is the minimum number of weighs to guarantee you know
which figurine is the odd one?
Part 1: You know that the odd one out is heavier than the others.
Part 2: You don't know if it's heavier or lighter than the others.