Campaign
The campaign is the main story: 11 chapters with 10 stages each. Stage 10 is the chapter boss. Every fight costs 10 energy. Each chapter exists on three difficulties (Easy, Medium, Hard) with their own progress; a chapter on Medium opens once you cleared it on Easy.
Stars
Every stage awards up to 3 stars: one for a win, one for winning with more than 50 % HP left, one for more than 80 % HP left. Star rewards unlock at 10, 20 and 30 stars per chapter, plus map chests for your total stars on a difficulty.
Map chests (total stars on one difficulty)
| Stars | Reward |
|---|---|
| 15 | 500 Gold |
| 40 | 1,200 Gold, 8 Gems |
| 75 | 2,500 Gold, 12 Gems,  Rare Chest |
| 120 | 4,500 Gold, 18 Gems,  Valuable Chest |
| 170 | 7,000 Gold, 25 Gems, Valuable Chest |
| 225 | 10,000 Gold, 35 Gems,  Epic Chest |
| 280 | 15,000 Gold, 50 Gems, Epic Chest |
| 330 | 25,000 Gold, 80 Gems,  Legendary Chest |
Medium and Hard use the same enemies, re-statted 4 and 8 levels higher.