"V1.1" typically refers to the second revision of the game released to address minor bugs or regional localization.
: There are at least five known versions: two Japanese (1.0 and 1.1), one North American (NTSC 1.0), and two European (PAL 1.0 and 1.1). Download Mario Kart 64 (V1.1)
: You can identify a physical V1.1 cartridge by the stamped code on the back label; a two-digit number followed by a letter (e.g., "00A") often indicates a later revision. Mario Kart 64 Amped Up 3.01 one North American (NTSC 1.0)