Here is the full solution for CraftConnections Day 7. Each group is shown with its difficulty colour and a redundant shape, so it stays readable if you are colour blind.
Classic — Day 7
● Shulker boxes Blue Shulker Box · Red Shulker Box · Orange Shulker Box · Purple Shulker Box
▲ Blocks that hold your stuff Hopper · Smoker · Furnace · Blast Furnace
◆ You mine these with an axe Composter · Oak Log · Block of Bamboo · Spruce Log
★ Crafted with redstone Compass · Crafter · Target · Block of Redstone