Jak II Glitches

Kiera Rift Mission - Unable To Complete Game
This glitch can prevent you from finishing the game so beware! If you have previously done the Jetboard or Stadium race challenge before and the flag icon appears when you enter the Stadium area, beware of this glitch.

As you enter the Stadium to do the Rift escorting mission, the wrench icon will turn into the flag icon. This means that Kiera and the Rift wont appear in the Stadium area. There is no way to bring her back and without doing the mission, there is no way to finish the game.

So don't complete any Stadium Challenges before doing this mission.