Credits: Vernian
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Author of the mod claims that these are waves, but to me it's look like a worm or a snake from the old game.
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How to install addons:
- Download addon into your device
- Find and open .mcpack or .mcworld files that you download earlier
- Click on it to import into Minecraft Pocket Edition
- Open the game
- Create new or edit an existing world
- Scroll down to Add-ons section and select the ones you want to apply