What is the solution to the mushroom farmer's card game?
So I have figured out the general gist of the solution: certain cards interact when placed next to each other. This allows you to place the fisherman next to the pond and get a fish. The cards retain their state as long as they're in play, so you can catch a fish, cook it and provide it to the hungry campers.
Here is the full solution:
Archer next to small animal, animal next to fire, cooked animal next to campers
Spearmen, then mammoth, then pond. Dead mammoth next to fire, etc.
Deer next to mushroom, archer next to tripping deer, deer next to fire etc.
Fisherman next to mushroom, then next to fire, then next to pond, etc.