: These ROMs use a custom graphical menu (often with low-bit music) that allows users to scroll through and launch games.

At first glance, a 300-in-1 ROM looks like chaos. The menu is usually a blocky, primary-colored list of numbers and broken English titles. You’ll find Super Mario Bros. listed three times (as “Mario 1,” “Mario Bro,” and “Dream Mario”). Sandwiched between them are obscure gems like Circus Charlie , Excitebike , and Urban Champion — along with 37 slightly different versions of Galaga and a bootleg where Sonic the Hedgehog falls through the floor of a Duck Hunt level.

The "300 in 1" label, however, is a masterclass in marketing exaggeration.

You scroll. The selection menu moves with a jagged lag.