Randomisation question

How would I set tiles to a numbers (say 1-64), then have a random number generator, every few seconds pick a number (the number cannot be repeated) and the object aligned to the number then fall?

I’ve been trying to work out how to sort this out for a few weeks now, I’ve just been hurting my brain trying to work it all out, I have a friend who is experiences with unity and he also doesn’t know how this would be done, I am new to unity and I would love to see this work, any one else got any ideas?, my game is heavily depending on the code to make the key mechanic happen.

“the number cannot be repeated” simply SHUFFLE the numbers first, then pull them off one at a time. this is an extremely well-explored general programming issue, just look or ask on stackoverflow.