To get to the the Twilight Forest, there are a few pre-requisites for the building of the portal.
- You cannot be in a biome where water freezes.
- You should be in a biome where grass can grow.
- The blocks surrounding the cut out area must have grass on them.
- The blocks below the cut out area must be grass.
- You need a diamond.
- You need roses, flowers, saplings, or mushrooms.
- You need buckets of water. (2 or 3)
Building the portal:
- Cut out a 4 block area.
- Surround it with either mushrooms, flowers, saplings, etc.
- Fill it with water.
- Throw the diamond in the water (using 'Q').
- You've got a portal, congrats! (If it is not working, make sure you are following the pre requisites).