The generator matrix

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

generates a code of length 18 over Z9[X]/(X^2+3,3X) who´s minimum homogenous weight is 33.

Homogenous weight enumerator: w(x)=1x^0+36x^33+672x^36+18x^42+2x^54

The gray image is a code over GF(3) with n=162, k=6 and d=99.
This code was found by Heurico 1.16 in 0.00213 seconds.