For instance; If i deposit Cryptocurrency and gamble and with I win can i be able to withdraw my winning through NGN?
Is it possible to happened and is there any gambling platform permits that?
This is a crypto gambling forum. We discuss crypto casinos here. I don't know about any crypto casino allowing withdrawals in Nigerian Naira.
You should take a look for local fiat online casinos in your country(I don't know anything about online fiat gambling in Nigeria, maybe there aren't such casinos in your country, I'm not sure).
What do you want to do? Do you want to launder money? Do you want to exchange some currency(crypto of fiat) for Nigerian Naira? There are money exchange services for that purpose and I think that you would risk losing your money, if you deposit them in a casino and play a game or two.