I think a good idea is to have a tree-like checkpoint-save system so you can always go back to the state you were in before descending down into a branch and go

I think a good idea is to have a tree-like checkpoint-save system so you can always go back to the state you were in before descending down into a branch and go down another one without replaying everything up to this point. It encourages replays and exploring all content. Papers please had something like this.