Topic: Name a game you feel the developer went the extra mile with

inFamous: Second Son. Adding the ability to change the weather and due to demand and adding photo mode in an update were going the extra mile.

Muramasa: The Demon Blade - One of the Wii's best games.

Anything metal gear, also I thought Skyrim was quite exemplary

Wonderful 101 definitely deserves to be mentioned again.

Shenmue.

(You can read about the development process in Dreamcast Worlds about the hassle the dev's had to go through to stop the management releasing it when it wasn't ready).

All commercial concerns out of the window.

Metal Slug 3

The final mission is probably longer than all the rest combined. Done when SNK was facing bankruptcy. It seems like they weren't going to start anything else so just kept adding stuff to it.