The exchange rate between the US dollar and the Nigerian naira is constantly fluctuating. To determine how much a 100-dollar PlayStation gift card is in naira, one needs to check the current exchange rate.

Typically, the value can vary depending on market conditions. Financial institutions and currency exchange platforms offer different rates at any given time. For example, if the exchange rate is around 400 naira to 1 dollar, then a 100-dollar PlayStation gift card would be approximately 40,000 naira.
However, it's important to note that this is just an estimate. Rates can change rapidly due to factors such as economic trends, central bank policies, and global market dynamics. It's advisable to use reliable currency exchange services or check online financial platforms for the most accurate and up-to-date conversion rate when making such calculations.