None. The Maid's room (castle first floor left) has the secret message, which you take to the girl on the upper floor of the Mill.
give it to the guy in the museum and he'll let you look around
Go to the guy in the green hood. Talk to him. He will give you the manure.
You get it in astro knights island. you go to the guy to the right of the castle and he will give you some.
In the field between the castle and the mill. A farmer will give you a bag.
After you get the coin the Museum of Mordred place and give it to the guy in there. Hope it helps.:)
It's only dirt. Push hard and it will give way.
In the castle, on the second floor. They will give you information on your quest to save the Princess.
When you cross the farm in the mill area, the farmer will give you a bag (but only once).
The farmer you meet near the hay bales will give you a bag. (just one)
You show her the message that you get from the castle (maid's room, first floor left).
You don't defeat knights, you talk to them and they'll give you a weapon to defeat a beast. (On the jungle planet, find the Laser Lance down in the plants before you meet Sir Cador.)
You go to your right from the castle. When you come to a boy with spots on his face he will give you some manure. (He is just left of the mill.)