a game, etc. that you have to think about carefully in order to answer it or do it 谜；智力游戏 
a crossword puzzle 纵横字谜 a book of puzzles for children 儿童谜语书
Culture crosswordscrosswordsCrosswords, or crossword puzzles, first appeared in the US in the early 20th century. Today, many people in the US and in Britain regularly do crosswords, sometimes on the bus or train on their way to work. Most newspapers and magazines contain at least one crossword and there are often prizes for people who send in the correct solution. Books of crosswords are also popular.Solving a crossword involves answering a set of clues. The answers are words or phrases which fit together in a patterned grid. The clues are usually numbered and listed as across and down, according to whether the answer reads across the grid or from top to bottom.There are two basic types of crossword, called in Britain quick crosswords and cryptic crosswords. In quick crosswords the clues are usually definitions of the answers. This is much the most common type of crossword in the US, where the grids are usually a lot bigger and contain many more words. These crosswords are not necessarily easy, and the one in the Saturday issue of the New York Times is considered very difficult.Cryptic crosswords, which began in Britain and are much more popular there than in any other country, have clues which contain both a definition of the answer and a word puzzle involving the letters in it. One common type of word puzzle is an anagram, in which the letters of the answer word are rearranged in the clue to form another word or phrase. For example, CARTHORSE and SHORT RACE are both anagrams of the word ORCHESTRA.Topics Games and toysb2Oxford Collocations Dictionaryadjective- crossword
- jigsaw
- logic
- …
- complete
- do
- put together
- …
- book
- game
- piece
- …
- [usually singular]
something that is difficult to understand or explain 不解之谜；疑问 The deeper meaning of the poem remains a puzzle. 这首诗的深层含义仍然是个谜。 The detectives were beginning to solve the murder. All the pieces in the puzzle were falling neatly into place. 侦探们开始侦破这起谋杀案。拼图中所有的部分都整齐地排列在一起。
Extra ExamplesThe origin of the word is something of a puzzle. 这个词的起源有点儿让人困惑。 The puzzle remains of what happened to the ship. 那艘船发生了什么事还是个谜。 There is a puzzle about how the plant first came to Britain. 这种植物最初如何传入英国还不清楚。 The police didn't know what the message meant, but it was another piece in the puzzle. 警方虽然不知道这个消息意味着什么，但它却是另一个难题。 They're trying to solve the puzzle of how gravity works. 他们在尝试解开重力是如何起作用的谜团。 Traces of explosives found among the wreckage were the key to the puzzle. 在残骸中找到的少许爆炸物是解开这个谜团的关键。 They knew who the killer was, but there were still some gaps in the puzzle. 他们知道了谁是杀人凶手，但是还有一些地方让人疑惑不解。
Oxford Collocations Dictionaryadjective- great
- perplexing
- scientific
- …
- crack
- figure out
- piece together
- …
- remain
- puzzle about
- puzzle of
- a piece of the puzzle
- the key to a puzzle
- a piece in the puzzle
- …
- (especially North American English) (British English jigsaw, jigsaw puzzle)
a picture printed on cardboard (= very thick, stiff card) or wood, that has been cut up into a lot of small pieces of different shapes that you have to fit together again 拼图；拼板玩具 Oxford Collocations Dictionaryadjective- crossword
- jigsaw
- logic
- …
- complete
- do
- put together
- …
- book
- game
- piece
- …
Word Originlate 16th cent. (as a verb): of unknown origin.