The latest Humble Weekly Sale is in and this week's features a selection of games by Codemasters. Some of them are based on four wheels, others are hark back to a time when the company produced games in a variety of different genres. Dirt Showdown and Dirt 3 join Overlord II in unlocking if customers pay over $6. On the other hand Overlord (plus Raising Hell DLC), Operation Flashpoint: Red River & Dragon Rising and RPG Rise of the Argonauts can be purchased at any price.