Meaning of doozy

[Luda from Minsk]

English Language Tests, Intermediate level

ESL/EFL Test #284 "English Slang Idioms (6)", question 3

Jenny thought that the last problem on the test was a real .......... It was much harder and more complex than any of the previous problems.

(a) doozy
(b) whooper
(c) carp
(d) Snafu

English Language Tests, Intermediate level

ESL/EFL Test #284 "English Slang Idioms (6)", answer 3

Jenny thought that the last problem on the test was a real doozy. It was much harder and more complex than any of the previous problems.

Correct answer: (a) doozy

Your answer was: ?
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hello! I've found that ''doozy'' means smth excellent. But in your sentence this word does not have such a meaning.

Luda from Minsk

[Mister Micawber]

Doozy=something extremely good/bad/difficult/thrilling/etc.
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Native English teacher at Mister Micawber's