Puzzle Quest: Challenge of the Warlords Discussion
There will be a link there which is a modified copy of the game to let it play as a "fixed exe" as the site calls it. This can be used in place of the steam executable.
On that same page, there is a trainer for v 1.02 that you can use in conjunction with the fixed executable which works.
* Updated game trainers and cheats daily
* Get notified when new cheats are added
* Request which games get new trainers
* Priority support with any problem