The Humble Introversion Bundle has reached more than $500,000 in sales, and is now offering charming roguelike Dungeons of Dredmor as a bonus.

At time of writing the bundle has been purchased 150,881 times and racked up $597,361.80 in revenue.

The DRM-free, cross-platform Humble Introversion bundle features four Introversion games at its core: Darwinia, Multiwinia, Uplink and DEFCON. Bonuses, for either customers who have already purchased the bundle or those who pay more than the average price - $3.96 at time of writing - get access to Aquaria, Crayon Physics Deluxe and now Dungeons of Dredmor.

The bundle also includes a prototype tech demo for Introversion's cancelled heist-sim Subversion.

The Humble Introversion Bundle will be available for the next six days.