This article explains how to add games to an NEC Classic using NES game ROMs you own and a Windows PC.
How to Hack the NES Classic FAST and Add Your Games
While the re-release of Nintendo's original home console only includes 30 of the best classic games, a new program makes it extremely easy to add more games to your NES Classic Edition using a Windows PC. That said, you'll need your own NES game ROMs.
Before you begin, you'll want to have your ROMs ready. To add games to your NES Classic:
With the console turned off, connect your NES Classic to a PC using a USB cable. Leave the HDMI cable connected to your TV to track your progress.
