Today, OpenBOR is the most versatile 2D side-scrolling engine available. It supports:

: Use in-game saving (OpenBOR’s native save menu) instead of RetroArch’s save state feature. The native saves are stored in system/OpenBOR/Saves and are more reliable across core updates.

Unlike many retro engines, OpenBOR supports branching level paths, allowing you to tell a story where player choices (or which boss they defeat first) change the ending. Key Fan-Made Epics

OpenBOR games are not ROMs in the traditional sense; they are software packages usually ending in the .pak extension. These files contain the sprites, audio, and logic of the game.

OpenBOR does not play standard ROMs. You need .pak game files.