The Walnut Marble Run

Clues in this puzzle

Across

• Channel cut into a piece of wood (6)
• Dark hardwood prized for fine furniture (6)
• Something you should never give up (4)
• Alloy of copper and zinc (5)

Down

• Natural pattern in a wooden plank (5)
• Sloped path for wheels (4)
• Lean to one side (4)
• Round shape, like a globe (3)

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