I decided to use NAND instead of NOR, but it’s effectively the same thing.

Scala:

//main
@main
def main(): Unit =
  var i = 15 //Choose any number here
  i = add(i, 1) //this increments i
  println(i)

//Adds 2 numbers in the most intuitive way
def add(a: Int, b: Int): Int =
  val pairs = split(a).zip(split(b))
  val sumCarry = pairs.scanLeft(false, false)((last, current) => fullAdder(current._1, current._2, last._2))
  return join(sumCarry.map(_._1).tail.reverse)

//Converts an integer to a list of booleans
def join(list: Seq[Boolean]): Int = BigInt(list.map(if (_) '1' else '0').mkString, 2).toInt

//Converts a list of booleans to an integer
def split(num: Int): Seq[Boolean] = num.toBinaryString.reverse.padTo(32, '0').map(_ == '1')

//Adds 2 booleans and a carry in, returns a sum and carry out
def fullAdder (a: Boolean, b: Boolean, c: Boolean): (Boolean, Boolean) =
  (NAND(NAND(NAND(NAND(a, NAND(a, b)), NAND(NAND(a, b), b)), NAND(NAND(NAND(a, NAND(a, b)), NAND(NAND(a, b), b)), c)), NAND(NAND(NAND(NAND(a, NAND(a, b)), NAND(NAND(a, b), b)), c), c)), NAND(NAND(NAND(NAND(a, NAND(a, b)), NAND(NAND(a, b), b)), c), NAND(a, b)))

//The basis for all operations
def NAND(a: Boolean, b: Boolean): Boolean = !a || !b

EDIT: replaced Integer.parseInt with BigInt(...).toInt to fix NumberFormatException with negative numbers.

try it online here

1. Put on gorilla suit
2. Teleport to the ISS for the second time

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Wow, this one took me too long.

The forum post you were referring to.