developers, have you been tweaking challenge mode recently? playing this game for a while, but have never experienced such extreme lags in CM as for the last 3 days. interestingly (suspiciously) lag does not affect enemies movement/attack speed, on contrary it looks like it is increased, it affects only hero. Please fix this. No fun wasting half of the challenge keys, especially when you are buying them.
We haven't changed challenge mode in recent patches, though they do rotate every week. We're working on fixing the lag/performance issue on high priority.
Reporting a bug: Lady Ember + 2 (blue rarity). Can't craft Item Voodoo rod. When Lucky orbs are converted to higher tier item, used in rod crafting, instead of adding up to inventory side, it increases requirements. That is, if req/inv is 1/1, converting lucky orbs makes 2/1, 3/1 and etc, instead of 1/2, 1/3..
 "Re:Archer"){kind=icon}
 "Galactic Grind"){kind=icon}
 "Idle - random card"){kind=icon}
 "Heroes and Titans"){kind=icon}
We haven't changed challenge mode in recent patches, though they do rotate every week. We're working on fixing the lag/performance issue on high priority.