Robot lawn mower ....

PS a 25% gradient is the equivalent of rising one metre in vertical distance (height) for every four metres in horizontal distance (length).

www.omnicalculator.com/construction/elevation-grade

I considered one for our garden but it looked v complicated with having to set up boundaries so it didn’t go off and mow half the neighbourhood. I pay someone £40 a month to do it for me, now

The NT garden where I volunteer has one and the grass always looks really good. Can’t help with the gradient though …