Keytrain Sucks

I have spent about 3 hours on Keytrain today.

Their observation module is flawed.

They have many questions with no correct answers.
And the "correct answer"  is the least correct.

There is a video where they mention "replaceable cartridge" fire extinguishers.
One question said the pressure has dropped, and the extinguisher is no longer functioning, What do you do: 

They wanted me to answer "replace the cartridge"      They did not give enough information to replace the cartridge, and the damn thing looked complicated.  Also, more cartridges would be needed, and none were pictured.

I answered, call the fire department... because no other answer was even close to being possible.

They also have a video where they show a few airplanes as simply graphical bling.  Then they ask if the damn thing has a radio in it.  I have no F*ing idea, you did not give me enough data!

(I replayed the damn video like 3 times... one of the airplanes is pictured as a bullet-art next to the no-radio class of aircraft... but there is not sufficient information.  It was not the topic of the damn video.