It's the Final Sunday Puzzle, People. Let's Talk Tubers.

The Martian is a book by Andy Weir about how potatoes will become the first food crop on Mars. Alright, it's about more than that, but anyone who has read Weir's novel knows potatoes get plenty of mentions. Anyway, the point is: This week, in honor of Mark Watney's space spuds, we're featuring a puzzle about Martian tubers.