The exchange rate between the US dollar and the Nigerian naira is constantly fluctuating. To determine how much a $500 Play Store gift card is in naira, one needs to consider the current exchange rate.

Exchange rates are influenced by various factors such as economic conditions, market forces, and central bank policies. At any given time, the value can change significantly. For example, if the exchange rate is such that 1 US dollar equals 400 Nigerian naira, then a $500 gift card would be equivalent to 500 * 400 = 200,000 naira.
However, it's important to note that this is just a hypothetical calculation based on a made-up exchange rate. In reality, the actual amount would depend on the real-time exchange rate available in the market. Financial institutions, currency exchange platforms, and even online marketplaces where currency conversions are done can provide the most accurate and up-to-date conversion for determining the exact value of the $500 Play Store gift card in naira at any particular moment.