Quick tips

• Check what comes next. Before you help a house, look at what it passes on. If nobody nearby needs that, it's a dead end.
• Save lonely houses for last. A house with only one lane is usually where the chain has to end.
• Plan two steps ahead. Think about where you're going and what you'll be carrying when you get there.
• Pick the harder one first. When two houses need what you carry, help the one that will be harder to reach later.
• Undo early. The longer you walk down a dead end, the more steps you have to take back.