How Do I higher or lower path build?

[ramdej]

Hi Devs/Forum user,

Firstly, If it was not for the live stream tonight, I would have not backed the game, so impressed so far and enjoying it so much, love the beautiful cartoonish graphics.

Anyhow, my question, how do I higher and lower paths?

Thanks all

Ramdej

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EDIT *

Never mind, i'm stupid, I didn't see the help in the top left....For anyone else just incase its left mouse hold.