Doodle God：Puzzle - Steamwork of Swamp and Magic

阅读中文

Create a locomotive of the simple things

1. Air + Water = Steam
2. Stone + Stone = Fire + Stone + Stone
3. Fire + Tree = Ash + Ash + Coal
4. Fire + Stone = Metal
5. Human + Metal = Tools
6. Metal  + Steam = Boiler
7. Boiler + Coal = Steam-engine
8. Tools + Tree = Tools + Wood
9. Tools + Tree = Tools + Wood
10. Tools + Wood = Wheel
11. Wheel + Wood = Cart
12. Cart + Steam-engine = Loco-motive

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