What did this to my pansies?

All of the leaves look like this and as a beginner gardener I am in a bit of a panic.

Does anyone know the cause and cure? Thanks!

 

Maybe Leaf spot, a general term that covers a whole lot of diseases, and which pansies are quite prone to. Picking off and binning/burning the affected leaves might have been enough to keep it under control if it hadn't already spread too much. You could spray with something like dithane, but if a disease is in the soil it'll probably just come back again.

Weak plants are more likely to succumb to diseases than strong healthy ones so it may be best to scrap the pansies and plant something new?