An easy way to kill all the bosses in spelunky 2 with no items.
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INDIVIDUAL GUIDES
Here are some more in-depth guides for specific strategies
Quillback -   • Video  
Vlad -    • Video  
Tiamat -    • Spelunky 2 - 6 Ways To Kill Tiamat  
Hundun    • Video  
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TIMESTAMPS
0:00 Quillback
0:34 Queen Bee
1:25 Vlad
1:43 Olmec
2:41 Anubis
3:16 Duat
3:53 Great Humphead
4:17 Kingu
5:00 Yeti King & Queen
5:24 Lamahu
5:47 Tiamat
6:14 Giant Frog
6:28 Hundun