To be brutally honest, the grinding is the part I'm less worried about, SaveEditor solves that problem. Or URM.
What I absolutely HATE about Sandbox is the time waste of looking for where the Dev (the guy I usually end up calling, THAT FUCKER) hid the next bit of story... I am OLD. I don't have many years left. Wasting them looking in a map or a succession of rooms where the next event triggers... is simply unbearable.
Mini-Games? Dude, I am 61 years old, I have an early onset of something similar to Parkinsons, my eye-hand coordination is gone, I have involuntary spasms of my fingers, I have bad eyesight that isn't correctable because of the shape of my corneas. That "Easy" one took me 4 tries... May your mother forgive me for the names I called her, I am sure she was a much nicer person than what I called her.
I am going to let you in in a secret, when you are making a game to be played by others, don't presume that they are copies of you. Ages and physical capacities will vary, enormously. Your "Easy" was a nightmare.
Sandbox, as in an event oriented game, ceases to be about a story, and about what event the "Player" was able to find and trigger. From that point on, there's really no story. When Devs decide to go the Sandbox route, they are confessing that they don't want to write a story anymore. They only want to play hide and seek with the events, wasting theirs and ours time in a patience test to see who gives up first. Me. I'm the one that gives up first.
Please do scrap it. And the Mini-Games too... or at least give us the consideration of being able to not play them.
Peace