So last week I was surprised to see that I was starting out levels with a 200% xplodium bonus, and after each wave the bonus would increase by 10%, and maxed out at 400%. This differs from the usual 100% start, 5% increase, and 200% max.
Today, I was disappointed to see that I started out at 100% again. I googled it and someone mentioned that it was a St. Patrick's Day easter egg of sorts, but this clearly doesn't apply to what I saw, since it was obviously not St. Patty's Day when I experienced this.
Can anyone explain this? Is there a way to unlock this "feature" again?