Loved this as a teen, although I actually don't think I ever got past year 3.

It's interesting to see how the "non-linearity" is still very linear, it's just that you have three different goals at once.

I just finished re-playing Day of the Tentacle with my kid, and what's amazing about that is the intersecting non-linearity. The three different characters each have multiple of their own goals, but they're forever needing to trade things back and forth, so often the path of one will be blocked until the other one has gotten the thing they need.

The map for the goals for DOT must be like spaghetti.