Treasure Island Event

Treasure Island (TI) is an event which takes place from time to time in Castle Age and lasts about a week.

A chance at rewards is given out once a day (every 23 hours). Other ways to get rewards are attacking monsters and using Favor Points.

Instructions
Here are the instructions given in-game:

HOW TO PLAY

1. 20FP for one spin, and a chance to win rare items.Lots of general upgrade materials incoming!

2. Get a free spin every 23 hours.

3. Attack a monster to get a chance to free spin.

4. You get extra rewards when the total number of spins reaches a certain amount.

5. Each spin can increase your lucky value. The higher your lucky value, the better your reward. You are guaranteed to win the ultimate prize –“Succubus Nightmare“ when your lucky value reaches 200.

6. Lucky value will return to 0 when once you have won the ultimate prize.

Rewards
Each spin gives you a chance at certain items, which often change when the event comes back. Usual rewards include Hero Crystals, Blue, Green & Red Crystals, Full Energy & Stamina Potions, Hero Potions, and Free Chest Roll.

For instance, for the event beginning on June 28th 2018, the rewards for one spin were:
 * Hero Crystal x3
 * Blue Crystal x3
 * Green Crystal x3
 * Red Crystal x3
 * Full Stamina Potion x3
 * Full Energy Potion x3
 * Balanced Hero Potion x3
 * Defensive Hero Potion x3
 * Aggressive Hero Potion x3
 * Free Chest Roll x1
 * Refine Crystal x3
 * Enhance Crystal x3
 * 10B Gold
 * Succubus Nightmare*

* The chance to win this prize without reaching a lucky value of 200 (by spinning 200 times) is probably extremely low.