i'm designing a puzzle that has all the laser cubes form a special shape with the red laser,
though there is one shortcut solution, it's not obvious but it is possible.

instead of having a object blocking the wrong solution straight away i want it to be hidden, until the wrong solution is activated.

the best way would be by using a laser relay to check if the laser's path is diverting, though putting a relay in place to detect a wrong option is just plain confusing...

is there a way to have a trigger react to if a laser is traveling through the trigger, like a invisible laser relay?

There is,but I can't remember what.. I'll look it up now.

EDIT: There's something called a point_laser_Target, but I don't know whether that would work for what you want, so you could try using a laser relay with no world model - this might still create a glowing sprite when it's activated, though.