Better Chances of Getting S-grade Treasure

Better chances of getting S-grade treasure is a limited-time event in Cookie Run where players who are purchasing Supreme Treasure Chest with using Crystal or summon ticket will have a better chance of S-grade treasures obtained.

Appearance
This event has been appeared several times, usually in a same time when the game releases new treasures.
 * circa June 2014
 * 26 July 2014 to 28 July 2014, 5 p.m. (GMT+9)
 * 30 September 2014 to 2 October 2014, 5 p.m. (GMT+9)
 * 14 November 2014 to 17 November 2014, 5 p.m. (GMT+9)
 * 28 November 2014 to 1 December 2014, 5 p.m. (GMT+9)
 * 25 December 2014 to 28 December 2014, 5 p.m. (GMT+9)
 * 1 January 2015 to 4 January 2015, 5 p.m. (GMT+9)
 * February 18 to February 22, 2015, 5 p.m. (GMT+9)
 * March 27 to March 30, 2015, 5 p.m. (GMT+9)
 * May 1 to May 4, 2015, 5 p.m. (GMT+9)
 * May 29 to June 1, 2015, 5 p.m. (GMT+9)