How to put in easy (story mode), normal (story mode) hard (story mode), and endless modes in my interactive story?

I was wondering how to create easy (story mode), hard (story mode), and endless modes in my story, let me create a breakdown of those modes:
Easy: is the most easiest mode to use. In this mode makes the story very easy to do.
Normal: is the easy mode to use, in this mode it makes the story very normal to do
Hard: is the hard mode to use in the mode it the makes the story hard to finish.
Endless: The mode’s goal is to collect as many special items as possible until Michael catches the player.
Twine Version: 2.3.14
Story Format: Harlowe 3