જ્યારે તમે હમણાં ખરીદો છો ત્યારે 35% બંધ બચાવો
Theres multiple sources online for this, but for GMS, the only multiplicative exp boosters are event, cs, and use. CS 3x (marvel) does not stack with event. Every other source of exp booster is additive (yes HS is additive as of V patch). In your case, given the 13 3x use coupons, you can get 12x from 2x event, 2x cs, 3x use.
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