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Laser Pointer shooting range ideas?

idea is to slightly modify the annoy a tron circuit to turn on a laser pointer at a specific time interval, then back off... Then i would put this into my lego mindstorms robotic thingy that will point the laser to random points on the wall

link to annoy a tron: https://www.instructables.com/id/Homemade_Annoy_a_thing_Annoy_a_tron/

thats all great and a work in progress, really just background info

real question, just askin, is what technologies are there that would allow a microcontroller to "sense" where the laser is pointing and then to link that info to an sensor that would find where the bb bullet hits? Then just give me a percentage of how far off i was from the dot, maybe in the form of an LED bargraph display like this one: http://www.goldmine-elec-products.com/prodinfo.asp?number=G8942

this isnt something i expect to do, but i want to do something with 555s and this looks like a pretty cool idea

to clarify, on the top part, the laser and lego mindstorms are 2 separate systems, one is simply mounted on the other, but by using the same timings it is possible to make them work synchronously... its a work in progress, stay tuned if interested