Filing Cabinet

 is the seventeenth level of More Bloons.

Completion
To complete this level, you need to pop the top left Tack Bloon by digging through 3 Tile Blocks with the first four darts, which will trigger the Spiky Bloon above it, resulting in a chain reaction with the rest of the Tack Bloons. Throw the remaining 2 darts at the remaining bloons to the left and to the right should clear the level.
 * If you cannot hit the target, try to pop more bloons with your last darts.

Trivia

 * This level has a formation of a cabinet.