1. An Alliance must reach 15 members to unlock the Extreme Challenge event.
  2. Only members with Lv.10 or higher City Hall can take part.
  3. Once the event begins, members can accept event quests to earn points.
  4. Players who joined an Alliance when the event is ongoing cannot accept any quest.
  5. Only the leader and R4 officials can remove public quests. Quests will refresh 30 min after deletion.
  6. Challenges come in 5 tiers: Starlet, Veteran, Master, All-star, and Historic High
  7. Alliances taking part for the first time will start at the Starlet tier.
  8. The top 5 Alliances with enough points in the Starlet tier and top 3 Alliances with enough points in the Veteran, Master, and All-star tiers will be promoted to the next tier in the next season of the challenge.
  9. The last 3 Alliances in the Veteran, Master, and All-star tiers and the last 2 Alliances in Historic High tier, or those with too few points, will be demoted to a lower tier.