The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  X  1  X  3  1  X  X  1
 0  X  0  0 2X X+3  X 2X+3 2X X+3  6 2X+3 2X  0  X  X  X 2X+3 2X 2X
 0  0  X 2X  0 2X+6  X X+3 2X 2X+3  3  X  0 2X+3  X X+3 2X X+6 2X+3 2X+6
 0  0  0  6  0  0  3  6  0  3  6  3  3  6  0  6  6  0  0  6
 0  0  0  0  6  3  6  0  3  3  0  0  3  3  0  3  6  0  3  6

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

Homogenous weight enumerator: w(x)=1x^0+506x^33+54x^34+1774x^36+324x^37+1944x^38+4392x^39+648x^40+3888x^41+4658x^42+432x^43+946x^45+90x^48+20x^51+6x^54

The gray image is a code over GF(3) with n=180, k=9 and d=99.
This code was found by Heurico 1.16 in 52.4 seconds.