If you've ever wanted to get all of the children attached to a Unity GameObject and turn them into an array, there is a simple way to do it. This tutorial shows you how to do it in simple C# code.
How To Get All Of An Object’s Children – Unity C#
Creating Checkpoints in Puzzle Script
So you have this idea for a great Puzzle Script game, but it involves checkpoints. You want the player to be able to reset to the checkpoint if they press reset or if they die. How do you do that? This tutorial will cover it, and it's very simple.
Stuart's Pixel Games 