Board Thread:Bloons Wiki and BTD News/@comment-138.67.203.128-20180815151701/@comment-138.67.203.128-20180815165415

Engineer: Pops 2 bloons in a horizontal or vertical direction with a range of 2 squares.

Top path:

Energy Prereq = 15. Sentry guns: Can place 1 sentry gun within 2 square range that lasts for 2 turns. Attacks from sentries can pop 2 bloons and have an attack energy of 2.

Energy Prereq = 17. Rapid construction: Can now place 2 sentries.

Energy Prereq = 32. Bloonchipper: Now places a bloonchipper as well as the sentries within range. The bloonchipper lasts for 2 turns, sucking up 1 bloon (not camo, lead, ceramic, or brick) within 2 square radius and popping it 1 layer each turn. When the chipper disappears, the bloons that were sucked into it are released at the same square.

Middle path:

Energy Prereq = 12. Wider service radius: Sentry and chipper placement, as well as bloon detection, now have 3 square range.

Energy Prereq = 18. 9-inch nails: Sentries and main gun can pop 5 bloons each, and sentry attack energy is increased to 4.

Energy Prereq = 36. Sprockets: Sentries and main gun shoot twice each turn.

Bottom path:

Energy Prereq = 14. IFR: Sentries and chipper can detect camo bloons.

Energy Prereq = 16. Heat-tipped nails: Sentries and main gun can pop lead bloons.

Energy Prereq = 36. Cleansing foam: Bloons in one adjacent square have 50% chance to lose camo and/or regen, and lead bloons have 50% chance of being popped.