It’s a non question with non answer. For the question doesn’t have a base for the question, and the formula is always changing for the base.
The problem with the question ‘Are games hard?’ is that you have to presume there is a written standard for what is considered a normal games. Is there a list in the studio telling them what the average persons mental capabilities are?
When someone makes a game there going to base the difficulty on what there head deems doable. Even if they did make a ‘easy, normal or hard mode’ it would still be based on what they deemed should fall under them sections.
Then you have the problem of puzzles that test different parts of the brain.
I don’t really have a solution the problem, this is due too many people having different mental skill sets.
You can’t win.
You can ether play the game, or you can’t.
You just have to do your research before buying a game.