Eternal Isles 21-10, which one are worse, the shadows or the viruses?

Bubble Witch Saga Eternal Isles 21 Level 10

Strategies, Pictures and Tips by Teresa Atkinson and Patti Frazier-Laundree (3 Stars). 3 Star video by Jorge Valenzuela Meléndez

There are 5 bombs across bottom circled in white. One shadow bubble is in center circled in green with scattered crystal bubbles around it inside orange circle. An infection bubble on each side, top circled in yellow. 

Starting Bubbles: 75
Recommended Potions: Ceiling, rainbow and extra
Useful Charms: Charm of Precision
Points to get 1, 2, 3 Stars: 100,000, 135,000, 165,000
Special bubbles:
Bomb Bubble Bomb Bubbles
Obstacle Shadow Bubble Shadow Bubbles
Mystery Bubble, Special bubble type Mystery Bubbles
Ghost Lock on Chain Lock Bubble (1 chain)

Pic EI 21-10a:  I would try to take the middle 3 bombs and up the centre out first to try to stop the shadow and virus bubbles spreading too far. When you have done that clear sides also until screen drops.

Next comes the chain, it has one lock, when you get through the chain there are two sets of 3 doom bubbles in the middle and 2 mystery bubbles on the ceiling at each side.

Either work around doom bubbles or go through the middle to clear the ceiling.

Pic EI 21-10b: Chain seen at top with lock in center circled white. See all the gold spiders at bottom. Yammy! :)

Pic EI 21-10c: The Chain is gone. Two short clusters of doom bubbles seen in red. Two mystery bubbles are in each corner marked white. Ceiling is seen. 10 gold spiders on bottom. 

Here are two videos to walk you through the level as well. :)

Eternal Isles 21 Level Previews

Bubble Witch Saga Eternal Isles 21 Level overviews

Level EI 21-1, Full Guide
Level EI 21-2, Full Guide
Level EI 21-3, Full guide
Level EI 21-4, Full guide
Level EI 21-5, Full guide
Level EI 21-6, Full Guide
Level EI 21-7, Full Guide
Level EI 21-8, Full Guide
Level EI 21-9, Youtube
Level EI 21-10, Youtube