a girl’s game vs a girl game

[Winwin2011]

Are the following sentence both correct?

1. Hopsoctch is a girl’s game.
2. Hopsoctch is a girl game.

Thanks.

 

[Rover_KE]

Are the following sentences both correct?

1. Hopscotch is a girl’s game.:tick: (A girl can play it on her own. Also 'Hopscotch is a girls' game = 'Hopscotch is a game for girls'.)

2. Hopscotch is a girl game.:cross:

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[Winwin2011]

Hi, Rover.

Could I ask another question, please?

A bird nest is the spot in which a bird lays and incubates its eggs and raises its young.

I wonder if it is correct to say “A birds’ nest” and “A bird’s nest” in the above sentence.

Thanks.

 

[Rover_KE]

Yes.

A bird's nest is the spot in which a bird lays and incubates its eggs and raises its young.
A birds' nest is the spot in which birds lay and incubate their eggs and raise their young.

Rover