The generator matrix

 1  0  1  1  1  1  1  6  1  1  1 2X  1  1 2X+3  1  1  1 2X+6  1
 0  1  1  8  0 2X+1  5  1 2X+6 2X+5 X+1  1 2X+8 2X+4  1  0 2X+8 2X+1  1  6
 0  0 2X  0  3  X X+6 X+3 X+3 2X+6  6  0  3 X+6  X X+3 2X+6  3 2X+6 X+6
 0  0  0  X 2X+6  6 2X+3 2X 2X+6  X 2X+3 2X+3 2X 2X  X X+6 2X+3 X+6  X  0

generates a code of length 20 over Z9[X]/(X^2+6,3X) who´s minimum homogenous weight is 33.

Homogenous weight enumerator: w(x)=1x^0+432x^33+360x^34+288x^35+3232x^36+2160x^37+5616x^38+9624x^39+12096x^40+11232x^41+9504x^42+2880x^43+360x^44+1168x^45+96x^48

The gray image is a code over GF(3) with n=180, k=10 and d=99.
This code was found by Heurico 1.16 in 2.2 seconds.