It's not a hard game, if your "wrong choice" shown right after you choose it and lead to immediate "game over".
It's hard if you only find out that you made a wrong choice atleast couple of hours later, and in most cases don't even know where exactly did you screwed up lol
Tried to play "Stein's gate" before... was forced to look for walkthrough how to get to the true end... Well, after looking at it, i'm sure that without it i would never get to it by myself... i don't know, it's some kind of hellish trial of unlimited errors...