De-populating the enemy's barrackz

Grunt(z) What to do to solve the mini-puzzle
Boomerang #3
Gauntletz #4
GooberStraw #5
Boomerang #3 usez the boomerang to (first) eliminate the two enemy gruntz that are outside the barrackz, then on the remaining enemy gruntz that are trapped inside (not very sporting ... but safe).
Then he movez to take his place on his CheckPoint Switch (CPS).

Gauntletz #4 breakz the Brick blocking the entrance to the barrackz, and then the two Ice Crystalz and pocketz a Coin .
Then he movez to take his place on his CPS .

GooberStraw #5 started sucking up Goo Puddlez outside the barrackz, then movez inside to clean up the place .
Then he movez to take his place on his CPS .

A new grunt #7 is baked and introduced into the game on the nearby GruntCreationPad and immediately decidez to arm himself (Tool #5).
Then he movez to take his place on his CPS . Time for finger dexterity exercise #1.