- Can be done on any field.
- A field like W1 with one entrance and path means you can put a leeching trap at the start to finance your gem bombs
- use Endurance with Overcrowd and Swarmling Domination to get lots of monsters to kill
- Drop bomb on the field ahead of the monsters (so the bombs don't do the killing)
- Pressing "B" will just duplicate your next gem in your inventory as a bomb drop, now every click is a bomb drop
- You can track your progress in on the map screen by clicking the Stats button