Engineer Rescue

"Rescue trapped Monkey Engineers! Each one you free before the bloons reach them is yours to use during the rest of the mission. Free at least one to pass the mission and unlock the Monkey Engineer."

- Bloons Monkey City Mobile level description

There are 5 Engineers that are trapped in cages along the path. Your job is to free at least 1 of them (or defend them all). It costs $450 to free each one and each one can be placed as a free tower. Engineers disappear if bloons touch them, and pop themselves, if you haven't freed them. If you do not free at least 1 Engineer and all Engineers are gone, it's instant Game Over. The highest bloon rank is ceramic.

Trivia

 * If you sell an Engineer, you will have to pay $450 to put him back on the track.
 * You can upgrade the Engineer to any upgrade in this level.