There were 12 world changes inroduced in the same summer update - Tibia 9.1
It went live on July 6. 2011.
Names of world changes:
1. Awash World Change
2. Demon Wars World Change
3. Horse Station World Change
4. Insectoid Invasion World Change
5. Overhunting World Change
6. Steamship World Change
7. Swamp Fever World Change
8. The Mage's Tower World Change
9. The Mummy's Curse World Change
10 Their Master's Voice World Change
11. Thornfire World Change
12 Twisted Waters World Change
Source TibiaWiki: https://tibia.fandom.com/wiki/Updates/9.1
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