Upgrades

Mill

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Improved Plow
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Explosive Trap
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Scarecrows
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Wind Spirits

Castle level 2

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Royal Training
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Builder's Guild
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Magic Armor
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Assassin's Training

Castle level 3

image of the Fire Archers
Royal Mastery
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Commander
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Castle-Up
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Godly Curse

Tower level 2

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Castle tower
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Sniper tower
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Armoured tower
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Bunker tower

Tower level 3

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Archer's spire
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Ballistic spire
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Fire spire
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Healing spire

Tower level 3 (pre 1.5)

image of the Long Bows
Fortress Tower
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Ballista
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Hot Oil
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Support Tower