In the point-and-click horror game The Last Door Chapter 4, you play as Jeremiah Devitt and explore the house and grounds of the home of another childhood friend.
To play, all you have to do is click to interact. The move you can try will be shown by the moving cursor. If you want to look at something you're holding more closely, click the magnifying glass. If you're ready to use something, just click it. You can also try to combine what you're carrying by clicking on one item first and then another. If they're meant to, they'll merge on their own. You don't have to wait for Devitt to walk through a door or other area change again if you want to go through it again. Just double-click it and you can go straight to the next area. You should play the first three parts first, or else this won't make any sense.
Have fun and good luck!