Letters arrive in the rows under the word. Tap a letter to place it. Hold a letter and drag it onto another incoming letter to mix: those two are spent, then you pick a new letter or a villager. PUSH sends the word down the road. Defence, Train, Build, and Attack sit above PUSH. Clear empties the word. Delete removes the last letter.
You win when the enemy castle is down and no enemy units remain. You lose when your castle is down and none of your units remain. Word length picks the unit: 1 Dog, 2–3 Pebble, 4 Warden, 5 Pikehand, 6 Courser, 7 Fletcher, 8 Borer, 9 Lobber, 10–12 Banner, 13–15 Apex. A new mixed letter is never one of the two you spent. The villager has 8 HP, stays 70 seconds, and repairs 70 castle HP if that whole contract is spent on the castle. Pause freezes that clock. A letter about to be taken counts down from 5 seconds.