Grey Mouse

The Grey Mouse sits in the legendary tier of Grow a Garden, which is the key signal for how to read it: legendary pets are rare enough that you almost never see them as a guaranteed buy, and far more often pull them from a low-odds egg slot. That rarity classification is the single most important fact here, because it sets expectations before you ever look at a hatch table.

Since our records do not lock in a fixed cost or a confirmed source egg for this entry, the honest read is that the Grey Mouse is a chase pull rather than a reliable target. You do not "buy" a legendary mouse efficiently; you grind the egg it rolls out of and accept that most hatches will be commons and rares along the way.

For players deciding whether to pursue it, the practical advice is to chase the Grey Mouse only if you like its passive and its look, not as an economy play. Legendary pets in this game are usually collected for prestige and a specific buff niche. If you want guaranteed farm throughput, spend elsewhere and let the Grey Mouse arrive as a lucky bonus.