I like to play video games that are either hard or easy and I would prefer anyone to show me how to make it to where my games wouldn't actually like and to find the perfect app to help with my game not lagging or crashing

I'm trying to add the game slendytubbies growing tension on my Windows 10 computer so if anyone on here has that game can you please explain to me on how the heck I am able to get the game please because I'm tired of trying to figure it out!