So I guess ya take the hill from the previous poster in creative and unlimited ways. So uh…
I hesitantly claim this hill as mine. If anyone wants to play this game?

I employ an army of mole people to tunnel up from underneath and pop up unexpectedly from beneath, rolling you down the hill and annexing the hill as part of the mighty mole people Empire.

I claim this hill by necro-posting in it and thus, being master of its undead slavery….

I claim this hill by letting the sun shine upon it, all undead must flee sunlight so the hill is mine.