Board Thread:Questions and Answers/@comment-4275518-20121212172815/@comment-86.178.103.110-20140924164020

Popping Power and Pierce are the same thing - the number of different bloons that a single projectile can pass through before disappearing. This is not to be confused with Layers Popped, which is the number of layers each hit will take off. For example, a 0/0 Sniper has Popping Power of 1, but Layers Popped of 2. I think Snipers are a special case, and the Monkey Fort doesn't enhance them. Note that most upgrades increase the Popping Power of the tower - very few incresae Layers Popped (Sniper upgrades and the 3/0 or 4/0 Mortar upgrades). Even explosions have popping power, but it is usually very high.

Here are some examples of Popping Power and Layers Popped:

Name                          Popping Power           Layers Popped

0/0 Dart Monkey:                 1                                   1

0/0 Sniper                           1                                     2

3/0 Sniper                           1                                     18

0/0 Ninja                              2                                    1

2/0 Ninja                             4                                     1

0/0 Buccaneer                   5                                      1

0/2 Glue Gunner               6                                      0

3/0 Dartling                       13                                    1

Sun God                           15                                    1

Spike-O-Pult                     18                                     1

0/0 Mortar                          40                                    1

3/0 Mortar                          40                                    2

No-Sacrifice Temple           50                                    1

4/0 Mortar                          100                                  5

Blade Maelstrom Ability      10,000 (!)                        1

Ice Tower                            Infinity (?)                        0

Ground Zero Ability            Infinity                              350

Techno-Terror Ability          Infinity                              1000