also: ジグソー・パズル · ジグゾーパズル
noun
jigsaw puzzle
Refers to the physical puzzle made of interlocking pieces, or metaphorically to a complex situation that needs piecing together.
週末に1000ピースのジグソーパズルを完成させた。
I finished a 1000-piece jigsaw puzzle over the weekend.
この事件はまるでジグソーパズルのようだ。
This case is just like a jigsaw puzzle.
パズル is a broader term for any kind of puzzle (crossword, logic, etc.), while ジグソーパズル specifically refers to jigsaw puzzles.
Loanword from English 'jigsaw puzzle'.