If this kind of game is popular, then it’s the end of the world.
You must be looking forward to seeing what your son might end up being in the future.
After a heated discussion, my youngest son left to bury my gold somewhere.
The kanji and the word are exactly the same. That means they share meanings as well. Throw a "the" in there if you'd like, as well.
Since this word is made up of a single kanji, it should use the kun'yomi reading. When learning the kanji, you didn't learn that reading, so here's a mnemonic to help you with this word:
You've reached the end of the universe. Nothing is there. You step out, and you're surprised because you get greeted by Sue. Imagine meeting this Sue, and talking to them for a while. You should come up with a Sue that you know or a famous Sue that you know. Just pick something you can remember.