Whoever said, "don't sweat the small stuff." Was an idiot.

Now. Think about all the small stuff in games that make you sweat in a good way. I'll start with two from hgss.

The fact that you can actually surf east from new bark into kanto after the fourth badge. And pic related getting the 7th badge after morty as well as red gyara and rocket hideout I.
The non linearity of johto in general.

The second is being able to catch wild fully evolved mons such as slowbro, golduck, tentarcuel, etc. 20 levels before they evolve by level up. Now we know how Lance got his level 50 dragonite (maybe he got it in isshu?)
But anyways what are yours? (Use any pkmn game.)