Most Challenging game you've Beaten?

[Scorpion]

What's the most challenging game you've ever beaten, and how did you feel afterward?

For me, defeating The Nameless King in Dark Souls III was toughest..

[killamch89]

For me, it was Hollow Knight. The platforming and precise combat really tested my patience, but the feeling of finally beating the final boss was incredibly satisfying. Like a massive weight was lifted off my shoulders.