tunnel
Cheats recipe will guide you to the creation of tunnel from starting items.
How to make tunnel in Little Alchemy 2?
earth + earth = 
land
water + water = 
puddle- water + puddle =
pond - water + pond =
lake - water + lake =
sea 
fire + earth = 
lava- lava + sea =
primordial soup - earth + lava =
volcano - volcano + primordial soup =
life - life + land =
animal - land + land =
continent - continent + continent =
planet 
air + air = 
pressure- earth + pressure =
stone - stone + planet =
moon - moon + animal =
wolf - water + earth =
mud - fire + mud =
brick - brick + brick =
wall - wall + wall =
house - house + wolf =
cave - fire + fire =
energy - earth + energy =
earthquake - earth + earthquake =
mountain - mountain + cave = tunnel