Gaming is flush with titles that are impossible to beat. I don’t mean so-hard-that-they-appear-impossible, or games with glitches that prevent anyone from seeing an endscreen (if there ever was one). I mean games that are ACTUALLY impossible to beat: they are/were designed so that nobody could truly defeat them.
It’s hard to overestimate the importance of Tetris. It influenced generations of puzzle games, sold millions of copies on multiple systems, crossed traditional gender boundaries (many of which still exist in gaming today), and continues to be one of the most popular titles of any generation of anywhere in the world. By almost any definition, it is THE video game of the 20th century.