That Cold Week is a solo, diceless campaign expansion where you follow a seven-day journal through bitter winter conditions. The first day's freeze prevents leaf growth entirely, forcing you to rely on stems alone. Throughout the week, completing three identical numbers in the daytime tracker lets you choose between bonus energy, a free leaf, or a free stem—offering flexible rewards for careful planning.
The expansion introduces cold-themed rest days, including scoring based on every "3" in your tracker and counting connected creepers. With its opening restriction and adaptable bonuses, "That Cold Week" creates a patient, deliberate solo challenge where every choice matters against the quiet bite of winter.