Obstacle crops have a negative effect in the game. Here you can find explanations of the obstacles found in Pig & Dragon.
When a crop is matched, but one or more of the crops are covered in mud, the match will not grant any points.
▣ Sea Shells
Sea Shells can be destroyed by clearing crops next to them.
▣ Ice pepper
When you switch Ice pepper with Red Pepper, Ice pepper is changed to a cross pattern. And Muddy Pepper in the frozen area becomes clean. If there are target blocks(=Goal Blocks) within the frozen area, you can get 2 points for each target block.
Crops covered by the next cannot be moved or cleared until the net is removed. The net can be removed by making a match including the covered crop, clearing the net while the crop stays intact.
Depending on the color of the barrel, when a crop next to a barrel is cleared the barrel will shoot water or mud.
Crops that are covered by the lotus will turn into a different crop after every move made.
▣ The Pig (Boss)
The pig can be defeated with the help of your dragons. Fill the breath gauge of your dragons by feeding them their favorite crops and they will attack them with a breath of fire.
The ivy is an obstacle which multiplies Crops in surrounding areas every turn. Match the Crops near the ivy as fast as you can