Digimon World 3 - Going to the satellite. It was so awesome when I was little. It was the final dungeon and the character pretty much alone at that point. And the Earth was threatened. So you go to a satellite above the real world to stop them. And there was bunch of annoying teleport puzzles and annoying bosses.

The entire fight against Galacticmon. To start things off, the Digimon you were going to fight fused with the final dungeon so you get to take out your frustration on the dungeon itself. And since it takes place in the real world out in space you can see the Earth when the camera pans around your team. Also the chest fires out a laser aimed at the Earth that your partner takes head on that leaves you with HP at the start of the final phase of the fight.