In the game, you can enter the portal knight coal acquisition interface through the following steps:
1. After opening the game, click to open the map.
2. Find "Sparrow's Castle" on the map and click "Teleport".
In the map, you can find Portal Knight coal in the following ways:
1. Search the map wall or floor for items with black patterns.
2. Use a pickaxe to hit the black patterned objects to obtain coal.
The obtained coal can be used to cook food in the game and improve the character's attributes. Please be careful to use coal wisely to keep your character healthy.