Released in 2000, the 3D platformer sees Kirby venturing to six different planets to retrieve the Crystal Shards and battle Dark Matter.
Recent leaks have heavily suggested that Nintendo will be adding Game Boy and Game Boy Advance games to the service's library.
In preparation of Splatoon 3's launch, Nintendo is giving away Splatoon 2's Octo Expansion for free to all base game owners subscriber to Nintendo Switch Online + Expansion Pack.
Three more classic Sega Genesis titles have been added to Nintendo Switch Online + Expansion Pack, which costs $50 per year.
Rumours have claimed for some time that Game Boy and Game Boy Advance games are set to be added to Nintendo Switch Online.
Nintendo also pledges to keep increasing the value of both existing variants of its online subscription service.
Exclusive to Nintendo Switch Online members, the controls will mimic the original N64 release but without matching in-game button displays.
The likes of Wave Race, Super Smash Bros. and many more could be added to the service's catalog in the coming months.
"Select games will also have the option to play the original European PAL version with language options," Nintendo says.
Nintendo Switch Online + Expansion Pack will include titles like Super Mario 64, Sonic the Hedgehog, and other classics when it launches.