Make Practice Mode

Imagine a mode where you could just practice any game.
You could play by yourself, and whatever game you pick has different things to offer.

TW: Practice Bridging and Hitting Players (Add mobs to practice hitting)
DR: Practice avoiding traps or turning them on (Npcs also)
Sky: Practice Pvp (npcs/or Mobs)
Just Build: Practice Building
SG: Irdk comment your ideas
MM: Practice throwing the Murder Throwable/Finding the murderer
H&S: Find the perfect hiding spot

I like this idea, but it has already been suggested here