Ring of Fire

"Throws out a fiery hot burst of flame that can pop anything"

- Bloons Tower Defense 4 Description

The Ring of Fire is the final upgrade for the Tack Shooter in BTD4. It is a level 5 upgrade unlocked at rank 22. Ring of Fire is effective to all bloons, but it cannot detect camo bloons without other special towers around. Unlike firing in 8 directions like its previous upgrades, it shoots fire in a 360 degree range. On easy this upgrade costs 2125, on medium, 2500, and on hard, 2700.

This tower is very useful and usually has a high kill count after waves 60+. In BTD4, this tower is a lot more effective than a Blade Shooter. This upgrade is good for thinning out lots of bloons packed together.

Strategy
The Ring of Fire fires at a rate slightly faster than the Tack Tower, and there are no holes in its range (sometimes, some of the bloons can slip between the tacks). If you pack many Rings of Fire together, even Ceramic Bloons can be popped in a few seconds.

Upgraded from (BTD4)
Tack Shooter→Faster Shooting→Extra Range→Blade Shooter→Ring of Fire

Bloons TD 5
The Ring of Fire is also in Bloons TD 5. It is the last upgrade for path 1, costing. It shoots out a circle of fire that can pop Lead Bloons and Frozen Bloons. However, it cannot detect or target Camo Bloons unless there is a Radar Scanner. It is almost the same as it was in Bloons Tower Defense 4.

Trivia

 * The iPod touch/iPhone version of the Ring of Fire has a greatly Hjkd.jpgased firing rate but does not shoot in a ring, rather with bursts of fire in 8 different directions. However the disadvantage to this are the "holes" between the fire bursts.
 * Lag can reduce the Ring of Fire's firing rate dramatically, especially when comparing it with the speed of the bloons.
 * The Ring of Fire has a slightly greater range than the Blade shooter in BTD4.
 * The Tack Sprayer upgrade might be slightly more powerful than the Ring of Fire if Premium Upgrade Tack Awesomizer has been purchased.