Roll up, roll up! Ladies and gentlemen, boys and girls, roll up! Step inside Filth Fair and marvel at maculation brought to you from the four corners of our grubby little world. Feast your eyes on fungi, fleas and all manner of feculence brought to you by the Wellcome Trust to celebrate their scandalous Season of Dirt. All imagined for you in a painted image by none other than that famed practitioner of the poisoned picture, Mr Mike Wilks. A heartfelt double WELLCOME to the Dirt Season game.

Download for free for your iPad, iPhone or iPod Touch.

Play the web version online.