Crafting for an Igniter (Where the TNT is, put the desired block for the portal):
It’s VERY simple. To create the portal, just make a portal frame just as a nether portal would be, with the material you want the dimension to be made of. Next, you need to craft the Igniter, which activates the portal. In the crafting table, put two sticks like you would do to craft a pickaxe, on top of the two sticks put an Ender Pearl, and on the sides put a block of the dimension and a flint and steel. Done!
Igniter Box: (or Portable Igniter Box)
It’s a block only obtainable from Creative. After being placed, when right-clicked, will open a Menu. From that menu you can get the Igniters without having to look for it in the Creative "Tools" Tab. There is also a Portable version – just right-click while having it in your hand to use it! KNOWN BUG: When you get an Igniter from the Igniter Box or the Portable Igniter Box, make sure to OPEN YOUR INVENTORY before using it!!! If you right-click before opening your inventory, the game will crash.
Nether Fortresses generate in these dimensions somehow?
If you have a slow computer, DON’T enter the Leaves Dimension!
Don’t EVER blow up the TNT Dimension!
Every Dimension has an ore. the Diamond Dimension has TNT, while the Leaves Dimension has Sponges, for example.
In Creative Mode, the Igniters can be found in the Tools tab.