Help Please How to make red blocks/ brick and metal useful?

I can't help as I don't understand what you are seeking. Please rephrase.

 

First off, 'Crash course' and 'Chaos Control' are not the same. There is no ball that rolls out in 'Chaos Control'?

Secondly, MekoStudio is a great tool. You can find it at MekoStudio.com and if you go to the '3D Builder' then you can look inside some ones card to see what they did.

Off the top of my head you are looking for a sensor. A sensor is just a motor that tends to move if a bot gets close. If you attach a motor to some metal and at the other end there is a ball on a rounded metal block, if a bot or ball walks close to the motor, the other ball will fall. Check out the card:

Also note that if R walks in from the grass section, the sensor is triggered as the metal is close to R.