Hardest Part of a Chess Game?

What do you think is the hardest part of a chess game, the opening, the middlegame, or the endgame?

Forsure the middlegame

middlegame

Middle tactical

I do suppose that the middlegame is usually the most decisive part of the game

Although I do think that all parts of a game are equally important (maybe openings are less important) because if you mess up anywhere you're still lost haha