What is a "losing game"? Is it an idiom?

[Rusalka]

Test No. incompl/inter-61 "Losing It (1)", question 10

Putting all your money in that enterprise is futile it's like playing a losing ..........

(a) part
(b) role
(c) section
(d) game

Test No. incompl/inter-61 "Losing It (1)", answer 10

Putting all your money in that enterprise is futile it's like playing a losing game.

Correct answer: (d) game

Your answer was: n/a
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What does it mean????
_losing game_?

[Alan]

This means a situation where you cannot win.
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[Katarzyna]

I have a question about the punctation in this sentence. Shouldn't be 'and', a comma or a semicolon between 'futile' and 'it's' ? Or is it correct? I got confused.

Putting all your money in that enterprise is futile it's like playing a losing game.

Regards

[Katarzyna]

I have a question about the punctation in this sentence. Shouldn't be 'and', a comma or a semicolon between 'futile' and 'it's' ? Or is it correct? I got confused.

Putting all your money in that enterprise is futile it's like playing a losing game.

Regards