They can also be used as a substitute against a building that has low health and if the energy cost of the next Critter shot is cheaper than either Artillery or Barrage.
However, when using Smokey Warriors or Smokey Zookas, it is recommended to save the Critters to distract the defenses rather than use them to clear Mines, and use Artillery and Barrage in their place.
Be careful when attempting to distract Mortars, Rocket Launchers and Shock Launchers, as firing Critters directly at them will not work due to their blind spot. Instead, fire the Critters close enough to the defense as to attract the attention of the defense, but far enough as such that they will not enter the defenses' blind spot. To prevent them from entering their blind spots when they land, it is best to deploy them on another building outside the blind spot.
Do not worry about your Critters after you deploy them, as they will not follow Flares or be healed by Medkits, so it can be hard to help them. Also, it does not matter if some die, as you will not waste time and gold on training new ones.
Critters can trigger Hot Pots leaving those open for a Shock Bomb and troops to destroy it.
Do not leave your Economy and Support Buildings unprotected. Critters can be used to gain lots of free energy while remaining away from defenses.
There are no visual differences between levels. Critters always appear as small blue robots with two gun barrels that look like eyes at the front, and four legs. It also has a searchlight at the front.
Each upgrade increases the number of Critters deployed per shot by one.
Defenses seem to prioritize Critters. If a defense is firing at troops, and Critter(s) enter its range, it will typically switch targets to the Critter(s) after its next shot.
This is because the Critter(s) attack every building at point blank range.
Critters also wander around your home base in the same way as the wildlife.
During an upgrade, they appear to walk around the building that is under construction/being upgraded unless it is an aquatic building.
Critters do not count towards casualties if they die.
Even with the searchlight, they cannot fire through Smoke Screens.
Critters will still continue to distract any Defensive Buildings in range even while the player is retreating.