Spike Shack
The Spike Shack unlocks use of the on-track placeables, Road Spikes. When placed on the track they pop passing Bloons, including Camo Bloons. 5 spike stacks per shack.
The Spike Shack unlocks use of the on-track placeable item, Road Spikes, that when placed on a bit of track, pop the Bloons. They are good for hitting Camo Bloons or other bloons that are about to get through. 5 spike stacks per shack.
Prerequisites
Terrain requirements Cannot be built on:
Lake Terrain, River Terrain
Footprint 3×3 (1×1 tiles)
Quota 1 when unlocked
+1 per 1 level after unlocking
Build cost City Cash 250
Power used Power 5
Build time Flash: 10 minutes
Mobile: 30 minutes
XP for building Experience 125

The Spike Shack is a Monkey Building in Bloons Monkey City. Each Spike Shack increases the population of Road Spikes by 5.

edit