Lots of posts on here all saying money ''pending'' from one game or another but I have never seen anyone actually get paid any money. The large amounts of cash folks are trying to withdraw are a lot more than any game could earn with their advertisement sponsorships.
They just want you to think you will get cash to make you play or watch their ads or videos. Research first as its very unlikely you are going to get a lot of money from playing a game !
The option to 'receive' paypal payments is sadly not available in Nigeria. You can only 'send' payments for purchases.
Paypal varies a lot country to country and can only offer the services that the banks / governments of that country allow it to offer. There are quite a few countries unable to receive paypal payments.