Climb down the ladder to the right, push the wooden box to the wall, jump on the wooden box and jump uphill through the wooden box.

After going uphill, continue to jump up along the arrow, jump to the top and run to the right.

Jump over two fire pits and continue to the right to find the old man in Tofu Forest. After knocking down the three monsters next to you, talk to the old tofu man. Knocking off the bean curd monster will drop the material "crystal bean curd".

Answer the old man's question correctly and you can get the formula. The first question is "preparing materials"

The second question is "Crystal Tofu *2".