Needed to use the first hint before I could figure out the game mechanism, and how the clue in the white square works. Initially, it was unclear if all the letters must be used or not.
Build strategy is better than a attack strategy due to its double function of defence and winning the game at 100 levels high. Building also cost fewer materials than attacking. Use crystals to do magic defence/bricks for the double effect.
 "ZS Dead Detective - Graves & Secrets"){kind=icon}
 "Tales of Nebezem: Gnomish Plot"){kind=icon}
 "ZS Dead Detective - A Curse In Disguise"){kind=icon}
 "Hat Wizard"){kind=icon}
 "Shift"){kind=icon}
 "Boo!"){kind=icon}
 "Song for a bird"){kind=icon}
 "Dead Detective vs Nine Deaths Cat"){kind=icon}
 "Castle Wars 2.5"){kind=icon}
 "BackDoor- Door 2"){kind=icon}
 "Music Catch"){kind=icon}
 "Shadowless"){kind=icon}
 "BattleHand"){kind=icon}
 "Proke"){kind=icon}
 "Ultimate Assassin 3: Level Pack"){kind=icon}
Well the game is still very new and besides, it's not really up to me :)