>>151633
You have to retry the area from the start when it reaches zero. Honestly, i only got like 175 tumors total when i reached The Future and i only noticed the counter going down in the last area ┐(ﾟ～ﾟ)┌
I was thinking about 100% the game, but i just learned all the shit necessary for all the carts and i really don't have the patience necessary