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Hello Everybody

Please tell me that which sentence is right?

(A) The online game is so popular that the company will soon start a new version and will [add new feathers allowing players to] buy real gifts for their partners.
(B) The online game is so popular that the company will soon start a new version and will [add new feathers to allow players to] buy real gifts for their partners.
(C) The online game is so popular that the company will soon start a new version and will [add new feathers to allowing players to] buy real gifts for their partners.
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The first two are fine. The last one is wrong. You want either the infinitive "to allow" or the participle "allowing". Combining both into one (where "to" is not a preposition), as in "to allowing", is never seen in English.

Note that if "to" is used as a preposition, the combination can occur, as in the expression "adverse to".

I'm not adverse to allowing the players to buy gifts.

Final remark: Please look up "feathers" in the dictionary. In this context you have, I think inadvertently, used the wrong word, which makes the sentences hilariously funny! You very likely meant "features"!

Emotion: smile
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Thank you.