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.
 * 1) 13 June 2014 to 16 June 2014, 5 p.m. (GMT+9)
 * 2) 26 July 2014 to 28 July 2014, 5 p.m. (GMT+9)
 * 3) 30 September 2014 to 2 October 2014, 5 p.m. (GMT+9)
 * 4) 14 November 2014 to 17 November 2014, 5 p.m. (GMT+9)
 * 5) 28 November 2014 to 1 December 2014, 5 p.m. (GMT+9)
 * 6) 25 December 2014 to 28 December 2014, 5 p.m. (GMT+9)
 * 7) 1 January 2015 to 4 January 2015, 5 p.m. (GMT+9)
 * 8) February 18 to February 22, 2015, 5 p.m. (GMT+9)
 * 9) March 27 to March 30, 2015, 5 p.m. (GMT+9)
 * 10) May 1 to May 4, 2015, 5 p.m. (GMT+9)
 * 11) May 29 to June 1, 2015, 5 p.m. (GMT+9)
 * 12) June 12 to June 15 2015, 5 p.m. (GMT+9)
 * 13) July 9 to July 13, 2015, 5 p.m. (GMT+9)
 * 14) August 7 to August 10, 2015, 5 p.m. (GMT+9)
 * 15) August 14 to August 17, 2015, 5 p.m. (GMT+9)