Nes Rom 99999 In 1 //top\\

That number doesn’t sound huge by modern standards (you can fit it on a USB stick), but here is the catch: NES emulators and flash carts have a memory mapping limit. The largest commercially available NES flash cart (the EverDrive N8 Pro) relies on an FPGA chip and an SD card. A standard "99999 in 1" ROM file cannot exist as a single *.nes file because the NES’s address bus physically cannot address that many "banks" of memory at once.

So, how did they get that number? The magic of the nes rom 99999 in 1

You will scroll past "Contra 1" to get to "Contra 1 (Infinite lives)" to get to "Contra 1 (Suicide mode)" to get to "Probotector (European)." That number doesn’t sound huge by modern standards