Here is the full solution for CraftConnections Day 14. Each group is shown with its difficulty colour and a redundant shape, so it stays readable if you are colour blind.
Classic — Day 14
● Blocks that hold your stuff Hopper · Blast Furnace · Brewing Stand · Dispenser
▲ You can eat these Golden Apple · Pumpkin Pie · Cooked Porkchop · Dried Kelp
◆ Ways to get around Powered Rail · Detector Rail · Activator Rail · Firework Rocket