First of these was Bloodwych (1989), featuring similar gameplay but adding a mode allowing two simultaneous players on one machine.

Starting with VSS 2005, Microsoft has added a client-server mode.

The later version added a manual mode, enabling the driver to select specific gears.

The "Free-For-All" pack, which is available free, adds a mode called "Keys to the City" to the main menu.

In the Game Boy Advance re-release, the developers added 11 new levels and four unlockable mini-games, as well as a multi-player mode.

Our next modification is to add a super-easy mode.

A new Haunted House mode has been added, a two-player mode in which players walk around a set course, with sudden and disturbing events occuring randomly.

The twelfth and thirteenth games add a "Casual mode" where permadeath is disabled entirely, and lost characters are returned at the end of the chapter.

A downloadable patch is available which adds a "casual" mode, essentially an easy mode, as the game was first known to be quite difficult.

Valve considered adding a competitive mode to Portal 2.