Introduction: Smith obtained the best Building System. Everything he built or renovated would be granted attributes! Excellent-grade hotel: guest flow +30%, exhaustion relief +30%. Since then, the guests of this hotel have showered the hotel with praise and have never stopped coming back. Exquisite-grade toilet: odor elimination +10, laxative +15. Since then, this toilet became gospel for those with constipation and a nightmare for those with diarrhea. Exquisite-grade home renovation: spouse cheating +20, owner career +15. Since then, though the owner of this house was cuckolded, his career did gradually improve. Perfect-grade tree-lined path: safety +30, environment +25. Since then, this path became the safest road in the country...