I got this image:
This is the sideview of my example for a 6 number randomizer.
The red is the 1x8 plate from which the projectile is shot downwards.
The blue are the 1x1 plates that will be triggered by a projectile, so use onProjectile hit on those to trigger your events.
The 2 orange are also 1x1 plates, but when they get onProjectileHit, they send an other projectile to try again to hit one of the blues.
The yellow with black arrows is the area the projectile will spawn in when shot down from the red brick.
Because the yellow doesn't start from the sides of the red brick, the orange bricks have only half the chance to get hit compared to the blue bricks.
So they can't be used for randomizing, because then you get wrong statistics.
I can also say that the best projectile to use is the radio wave.
They don't make much noise or destroy bricks.
I think they are specifically designed for these types of contraptions too.
woah did not know this about the edge chance ^
Yeah, that is why when you shoot a projectile from a 1x1 brick it will always spawn at the exact middle of the brick.
Because it starts at half a stud away from the sides.
And because the 1x1 brick is only 1 stud wide, it starts in the middle.