RPG Maker MZ/MV Expert Tutorial
Chase Between Maps (Ao Oni)
Popularly known as the Ao Oni mechanic, you too can make an enemy chase the player between maps! The process is surprisingly simple.
There are two versions:
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Remake - Simplified for the efficient developer. Part 2 will use script calls, but you'll see how surprisingly simple they are.
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Original - Switches are used to provide stronger manual control. You'll see what I mean in the 'hide' tutorial. However, I don't recommend this way as you typically won't need the aforementioned 'manual controls.'
The script calls spreadsheet quick link (credits on the page) - https://docs.google.com/spreadsheets/d/1-Oa0cRGpjC8L5JO8vdMwOaYMKO75dtfKDOetnvh7OHs/htmlview#gid=0

Part 1 - The Basics
Start with this video to create the 'Ao Oni' mechanic.
Featured tutorial lessons:
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Getting player ID
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Transferring events using variables
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Erase Event

Part 2 - Redesign with Common Events and Script Calls for the Efficient Developer
In this tutorial, we will use common events and script calls. If you're new to either, you may feel intimidated. Don't. Study and master the common event and script calls. If you do, you'll see how much more you can do with the RPG Maker engine.
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The script calls spreadsheet quick link (credits on the page) - https://docs.google.com/spreadsheets/d/1-Oa0cRGpjC8L5JO8vdMwOaYMKO75dtfKDOetnvh7OHs/htmlview#gid=0

Part 3 - Hiding from the Ao Oni
In this tutorial, you'll learn how to add to our code to incorporate hiding. You also obtain a better understanding of the following:
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the difference between Parallel Process and Autorun
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How to interrupt a parallel process page by triggering switches on/off
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Quick chat on gameplay sacrifices made as an indie game dev
CLASSIC
These two versions are from the original tutorial videos. They achieve the same goal with a few added steps, specifically by using switches and tracking where the player exits/enters from. While I don't recommend doing it this way, you will see that you can achieve more manual control as in Part 2: Hide.
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This older series is designed for those who want a deeper understanding of switches.