I have fixed the main problem, now negative frozen will not disable the card.
Regarding the secondary bug of quest applying Frozen 0: do you think this quest will be too hard for non-Adventurer if I change the frozen formula to (difficulty + 2)? The other solution would be to just 'cap' formula: max(difficulty + 1, 1), but I try to make sure that at least difficulty of +-1 affects as many quests as possible.
Wouldn't frozen 2 make it free for non-Adventurers and very hard for adventurers? Because even frozen cancels the upgrade effect *and* single use, but odd only cancels upgrade? Maybe I am misunderstanding how that works. In any case, the quest is only particularly difficult if playing the upgrade card an integer number of times doesn't result in winning-- in that case you need some sort of special effect to change the amount of frozen it is. I don't think having to play it another time would be particularly hard
Every time Frozen is played, it is reduced by 1 and the rest of the card is skipped. So 'Frozen 2' card will have to cycle through the deck 2 times before it works. When reaching zero, Frozen disappears. I will improve effect description to make it more clear.
The previous bug was due to the fact that I compared "frozen === 0" rather than "frozen <= 0".
>I don't think having to play it another time would be particularly hard
Ok, changed it to (difficulty + 2)
