Possible other ways of earning coins:
- Digging the Graveyard
- Attacking other players through the Leaderboard
- Buying with real currency
- Doing Missions
- Receiving as a Gift
- Getting attacked by a player and winning the battle
In battle you earn [enemy's zombini level + enemy's zombini rarity + 3]coins per every your zombini's attack. 2xDamage attack will give 3x more coins than normal, 3xDamage attack will give 9x more coins than normal, and 4xDamage attack will give 21x more coins.