This is a simple example of how one might create an enterable container to serve as a tent that the player can enter and exit plus few other container 'tricks'.
Rooms Within Rooms was created with Inform and has IFID 3EFFA3CB-3023-4DD5-AF4C-E95BED2C8313. To play a work like this one, you need an interpreter program: many are available, among them Zoom
for Mac OS X and for Unix; Windows Frotz or Windows Glulxe for Windows.
Or you can play without downloading anything by following the 'Play In-Browser'
on your web browser.