Atari Lynx

The Atari Lynx is a portable Atari console that was competing with the Gameboy. The console was released in 1989. The Atari Lynx was the 2nd best selling portable console behind the Gameboy, but then the Sega Game Gear came out and it made it fall down to third. While the console received positive reception, it flopped financially. The console failed because of its game library and its minimal advertising made it a commercial failure. In 1991, Atari said that the console sold 800,000 copies, while the Gameboy sold 16,000,000 copies in the same year.

Links
https://www.thegamer.com/15-gaming-consoles-that-failed-miserably/

https://en.m.wikipedia.org/wiki/Atari_Lynx

https://en.m.wikipedia.org/wiki/List_of_commercial_failures_in_video_gaming