Pro Evolution Soccer 6 is one of Konami's highly successful Pro Evolution Soccer franchise. Released on October 27, 2006 for the PlayStation 2, Xbox 360 and PC platforms and following on the Nintendo DS and PlayStation Portable on December 1, 2006, Pro Evolution Soccer 6 is the 6th edition of the series for the PlayStation 2, 2nd for the PlayStation Portable and 4th for PC. This year features Pro Evolution Soccer 6 making its debut on the Nintendo DS and the Xbox 360. The Xbox 360 version features improved graphics, but retains gameplay similar to the other console versions. The edit mode has been stripped down for the Xbox 360 release, due to time restrictions. The graphics engine on the PC does not utilise the next-gen 360 engine but will again be a direct conversion of the PlayStation 2 engine.
A Bundesliga license was supposed to be a feature of the game but Konami were forced to remove the Bundesliga license, which means the Bundesliga is not present in PES6, not even as a series of unlicensed teams.
This is the first time the International Challenge Mode has been included on the PES Series. Usually this is seen on the Japanese version - Winning Eleven - where you play as Japan and take them through the qualifiers to the International Cup and then attempt to win it. On PES, however, you have the ability to choose any playable nation on the game. The user can only play the qualifiers from Europe, South America and North/Central America. Although the tournament is not licensed, the qualifiers have a lot of similarities:
- A cross-playoff is used between a South American team and an Oceanian team, and a North American team plays an Asian team.
- There is the same number of qualifiers on the game from each region as there is in the real World Cup. e.g, 14 qualify from Europe.
- The qualifiers from South America are the same - 10 teams play each other twice with the top 4 qualifying and 5th place entering the cross-playoff.
- The qualifiers from North America are the same - 6 teams play each other twice with the top 3 qualifying and 4th place entering the cross-playoff.
Team selection can be changed before each game and the player can choose from any player with the eligible nationality.
It should be noted that there are many more unlicensed national teams available in International Challenge Mode featuring full squads. Still those teams can not be selected to be used in International Challenge or any other game mode. These teams are Bosnia and Herzegovina, Estonia, Israel, Panama, Honduras, Guatemala, Jamaica, Bolivia, Venezuela, China, Iraq, Jordan, Kuwait, UAE (United Arab Emirates), North Korea, Uzbekistan and Bahrain. The International Challenge mode is only available in the PlayStation 2 and PC versions of Pro Evolution Soccer 6. The Xbox 360 and PSP versions do not include this mode.