Mega Man: The Wily Wars is a 1994 video game compilation developed by Minakuchi Engineering and published by Capcom for the Sega Genesis; the compilation features remakes of the first three Mega Man games, alongside a new game called Wily Tower, only unlockable with a completed save file.
The game saw a physical release in Japan and Europe on October 21, 1994 and April 3, 1995 respectively. The physical North American release was cancelled, with it only seeing the light of day as part of the Sega Channel service. In 2019, the title was one of the 42 games included in the Sega Genesis Mini. Then, in 2021, it finally got a physical release on cartridge in North America by the company Retro-Bit. On June 30, 2022, the compilation was also added to the Nintendo Switch Online + Expansion Pack library.
Source: Wikipedia, Mega Man: The Wily Wars, available under the CC-BY-SA License.