Help to create a simple stealth game level

Hi team,
I am a school teacher that works at an alternative school for kids who have been kicked out of mainstream education. We are studying Colditz, the story of allied prisoners of war who escaped from captivity.
We would really like to have the ability to create a stealth game level like the Unity tutorials here

But this asset has been depreciated from the store and I cannot find it anymore. Any ideas where I can find some info so that I can use some tutorials (or I can make a set of tutorials) to create a simple stealth level with my students.
Any and all advice will be greatly appreciated
Thanks and have a great day
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So for a stealth level you can try some simple platforming scripts for your character. Then add obstacles that have triggers that when entered, cause the player to die (he was found). If you want guards use navmesh components and give the guards a trigger that when the player enters the guard will attack the player and depending on how you want it either chase the player (navmesh) or kill the player.