The last 3 levels will mainly give you only Dusty Coal (useless loot). So Heaven's Door is the last level to farm money and loots. The spells I use for the last level are Fire Storm, Ice Storm, Poison Storm, Energy Storm, Treasure Hunt, and Warlord. Equip the highest damage weapon and increase your rage capacity. Repeat Heaven's Door for good gears. I got a helmet that gives 30 rage capacity and a weapon with 60 damage + 100 health bonus. The way this combo works is collecting just 2 types of mana at the beginning of the game, one you have enough to use any Storm spell, go for it. keep repeating other Storm spells until you have enough for Warlord. Keep watching your rage and use it too because the Storm spells might break rage gems in chain reactions. When there are too many coin on the puzzle board, use Treasure Hunt or other spells to get rid of golds. This way, I barely use the puzzle board. Mostly just the spells and attack.
If minimum of each piece is one dot, can't one dot be the default instead of blank? Iterating through the options could have as well been 1, 2, 3, i.e., remove the blank.
Dear new players, the key for the easy badge is that you should also hire some swordmen, not only peasants. Your swordmen can easily defeat enemy's militiamen (peasants).
To give more idea on how long you need to play to get all badges. I did it in 48 game days. My level is 34. Total game time is 6:44 hours. Dudley is not that difficult to defeat so, don't worry.
If you want the hard badge but have trouble with The Killing Floor level, winning all achievements and play the last bonus level might be easier. That's what I did!
 "Dibbles: For The Greater Good"){kind=icon}
 "Puzlogic Plus"){kind=icon}
 "Elements of Arkandia"){kind=icon}
 "blue"){kind=icon}
 "Hexologic"){kind=icon}
 "Crystal Story"){kind=icon}
 "Sky Garden"){kind=icon}
 "50 years (graphical)"){kind=icon}
 "Pixoji"){kind=icon}
 "Get Out v2.0"){kind=icon}
 "Papa's Taco Mia!"){kind=icon}
 "Notebook Wars 2"){kind=icon}
 "Shop Empire 2"){kind=icon}
 "Jacksmith"){kind=icon}
 "Stealth Hunter 2"){kind=icon}
 "How Dare You"){kind=icon}
 "Zak"){kind=icon}
 "Super Adventure Pals"){kind=icon}
 "Home Story: 1971"){kind=icon}