Mouse element can be used to combine Bat, Computer Mouse, Hamster, Mousetrap, Rat, and Squirrel in Little Alchemy 2. The process of making Mouse is not easy, but we have figured out the easiest way. You need at least 25 steps to achieve the goal. You have to make Life, Animal, Human, Livestock, Cow, Milk, Cheese first. Check out the detailed walkthrough and try it yourself.
Fire + Earth = Lava
Lava + Earth = Volcano
Water + Water = Puddle
Water + Puddle = Pond
Water + Pond = Lake
Lake + Lake = Sea
Earth + Sea = Primordial Soup
Volcano + Primordial Soup = Life
Earth + Earth = Land
Land + Life = Animal
Earth + Water = Mud
Air + Air = Pressure
Earth + Pressure = Stone
Air + Stone = Sand
Sand + Mud = Clay
Clay + Life = Human
Animal + Human = Domestication
Domestication + Animal = Livestock
Earth + Life = Soil
Life + Soil = Plant
Earth + Plant = Grass
Grass + Livestock = Cow
Cow + Water = Milk
Milk + Time = Cheese
Animal + Cheese = Mouse