A free mod for The Sims 4, by Teknikah.
This is an override for the shower rooms in the game.
Each of the shower rooms has a different theme and look, but they all have the same basic layout. There is a big, blue, bathtub in the middle, and you can get water in it and wash yourself. There are some shelves to place your belongings and a small window in the wall to look out.
The gameplay is simple and easy to understand. You can mix and match the different rooms and even the decorations.
There is no time limit and no objectives to complete, so you can play as much as you want.