right or wrong?

[Bonychat]

Can I say

Once where various outdoor games ruled is now being dominated by ....?

please tell the sentence formation with "Once where"

[Beeesneees]

That sentence doesn't work, perhaps you mean something like:

Where various outdoor games once ruled, the field is now being dominated by... (something else).
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Cheers m' dears!

[Bonychat]

Thank you.....just a small question like

Can I use once at the beginning of the sentence? Like....

Once where various outdoor games ruled, sth is now dominant there.

[Beeesneees]

That doesn't quite work, sorry.

The only usage of 'once where' is in two different clauses of a sentence, where the second part adds information to the first:

I read a book once, where the characters all moved to a desert island.
She saw a film once, where the hero took flight in a hot air balloon.
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Cheers m' dears!