The game can be played against the computer in single player mode.

The single player mode was changed slightly from the first game.

I've still been buying these games for the single player modes only.

That is possible due to the light being of a single spatial mode.

There is still a single player mode, with 25 missions to complete.

However, they cannot make the large keys and doors on single player mode.

A single player mode is available in which the opponents are controlled by the computer.

Action Half-life also has support for a single player mode.

Unlike other single player modes, there are only three opponents.

If anything it's the single player mode that's become the optional extra.