The final upgrade to the two single-player games was made available on February 18, 2005.

By contrast, many single-player games are built around a compelling story.

"But I end up feeling in a single-player game that there's no one to share your accomplishments with."

You mean there are still a lot of people who like single-player games?

The single-player game was considered too easy and too short.

You can finish the single-player game in about 20 minutes.

That said, it's primarily a single-player game, and those issues doesn't really affect the experience much for me.

In the single-player game, a form of gravity is the opposition.

From the beginning of the single-player game, all players' characters begin at the base level.

In a single-player game, there is a story mode feature.