Wonderstone is basically a jewel which you can insert into the material slot in windmills to boost its performance.

You can buy all wonderstones from Felipe stall in Bazaar, limited to one each.
The only exception being Blue Wonderstone, which you receive from Issac as request reward.


To use, slot it to that empty round hole at the left of your windmill interior.
To remove, you need your windmill to be not crafting anything first.

Purple Wonderstone
Using it allows you to craft special items like sunstone, sprinkles, ultimate tools and etc. Different windmills unlock different items.
Suggestion: Use only when needed.

Green Wonderstone
Expand craft slots from 6 to 12
Suggestion: Good to use on Red windmill to do parallel crafting on wood and rocks along with vinegar, flour, mayonnaise and what not.

Blue Wonderstone
Make crafting faster
Suggestion: Use on Blue windmill when rushing stone and lumber for ultimate tools material grind. Also helps in speeding up seeds.

Red Wonderstone
Increase quality of the items it produces.
Suggestion: Good when making accessories. *Might* also be worth it if you're preparing 7 star ingredients for cooking contest.

Orange Wonderstone
Instead of 10, process up to 30 pieces at one time. Note that it doesn't exactly make crafting faster like Green and Blue.
Suggestion: Ideal when churning plenty of Honey, or items which has minimal craft time.

Yellow Wonderstone
For every 5 items crafted, gives 1 extra bonus.
Suggestion: Yellow windmill without a doubt, given how expensive Stone and Lumber are. Also feels very good if you're crafting accessories.
1 extra Ultimate Stone = 5 free Sturdy Stone = 25 Rock.