brainteaser
noun [ C ] uk/ˈbreɪnˌtiː.zər/ us/ˈbreɪnˌtiː.zɚ/ (also teaser)
有趣的难题；智力测验题
a problem for which it is hard to find the answer, especially one which people enjoy trying to solve as a game
The paper publishes two brainteasers every Saturday. 这份报纸每个星期六都刊载两道智力测验题。