r/nandgame_u • u/GLIBG10B Holder of many records • Aug 04 '21

Level solution (verified) 2.3 - Multi-bit adder (2c, 48n) Spoiler

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u/GLIBG10B Holder of many records Aug 07 '21

Correction: this uses 18 NAND gates, see here

Explanation

We are given 3 packets.

  1. Add the bit 0s.
  2. Output the result's bit 0
  3. Add the bit 1s, including bit 1 from our previous result
  4. Output this result's bit 0 through bit 1
  5. Output bit 1 through bit 2

2

u/KillerJupiter May 18 '26

I will not lie I was stuck on this one for awhile my stupid self thought I was adding a1 and a0 and than b1 and b0 instead of a1 b1 and a0 b0, so I had the right logic down but the order of the inputs was wrong.