Can I make a stone gate in Minecraft?

This is not possible anymore. The offer to have gotten a free code for buying Java Edition is now expired.

There isn't a seed for a puppy world, but you can add a bunch of dogs in creative and tame them, then switch back to survival.

Hit the other stone at a slant, from the bottom to the top, so the top is pointier. Don't hit too hard or too soft.

The clay pieces would have to be glazed, but you can definitely carve them out of wood. You'd need special equipment if you wanted to carve them out of stone.

Yes. At least one ambitious player has designed a virtual redstone computer that can run a simplified version of Minecraft in the game.

You just follow the instructions that are listed above and you can use any wood but not stone or any other material.

In the current version of Minecraft, only wooden gates are possible.