The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1
 0  6  0  0  0  0  0  6  6  0  3  3  0  6  6  3  0  6  6  0
 0  0  6  0  0  0  0  3  6  3  0  3  6  3  3  0  3  3  3  6
 0  0  0  6  0  0  6  3  0  0  3  3  3  3  6  0  3  3  6  0
 0  0  0  0  6  0  3  3  0  3  6  0  3  6  0  3  3  3  3  0
 0  0  0  0  0  6  3  3  6  6  3  6  3  0  6  3  0  0  0  0

generates a code of length 20 over Z9[X]/(X^2+3,3X) who´s minimum homogenous weight is 30.

Homogenous weight enumerator: w(x)=1x^0+68x^30+128x^33+90x^36+92x^39+5832x^40+100x^42+96x^45+110x^48+40x^51+2x^54+2x^60

The gray image is a code over GF(3) with n=180, k=8 and d=90.
This code was found by Heurico 1.16 in 0.0749 seconds.