Hero Challenge

Overview
There is a campaign that can to test out how far player's base defense will survive against the hordes of heroes. This campaign will unlocked/available at Spaceship level 5

Rules

 * 1) Take a part in Hero Challange. Player will get plenty of Power Stones & Soul Chest as a reward if base defend was successfully against heroes' attack
 * 2) Player's troop at army camp or zombie camp won't defend player's base from heroes' attack. Only Heroes and defense building can participate
 * 3) Difficulty level are divided into 4 levels, they are :
 * 4) * Easy
 * 5) * Normal
 * 6) * Extreme
 * 7) * Hell
 * 8) Each difficulties have 10 stages
 * 9) The number of heroes hordes and their level will increase every stages
 * 10) Player have 3 chances for free, player can add more chances by spending a sum of crystals
 * 11) If losing from these challenge, player won't lose their chance. If won, chances will decreased
 * 12) If player win some stages, player can use swipe button challenge to shorten the time, but chance will decreased
 * 13) Chances will add in 8 hours per chances from player's challenge

How to Play

 * 1) When on the base interface, press Campaign button to enter Campaign interface menu
 * 2) At the interface, press Hero Challenge button menu, player can choose which challenge level will be
 * 3) The number of heroes and heroes level will increased every stages
 * 4) Builder can help player base from zombies attack by repair damaged buildings (except hero). So, don't let builder station get downed
 * 5) If player can survive from heroes attacking, player will get plenty of power stones and soul chest
 * 6) Every Wednesday and Thursday, reward will be doubled. Don't miss out