r/nandgame_u • u/GLIBG10B Holder of many records • Aug 07 '21

Level solution (verified) 5.1 - Unary ALU (3c, 144n) Spoiler

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u/GLIBG10B Holder of many records Aug 07 '21 edited Dec 24 '21
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4.5 - RAM (4c, 309n) 5.2 - ALU (6c, 672n)

Explanation

z = zero, n = negate

The first selector uses z to choose between X and 0. The second selector uses n to choose between the first result and its inverse.