checkpoint9.sav and for each file change the first number on the first line to indicate the level (such as 0 The Pillar of Autumn) Repeat the previous step until you have ten files named checkpoint0.sav. In this directory create a text file called checkpoint0.sav with the following text included: 0,0,0 0,0,0 0,0,0 You will find this in the My Documents folder (such as D:Documents and Settings.My DocumentsMy GamesHalosavegamesAll_Levelscheckpoints) From Windows, locate the 'checkpoints' directory for the newly created profile. Therefore, attempt this at your own risk.

To access all of the levels in the game, you have to mess with your game directory, which could cause problems with your game or cause other problems.