The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  2  1  1  1
 0  2  0  0  0  0  2  2  2 2a 2a 2a+2  0  0  2 2a  2 2a+2 2a+2  2 2a  0 2a  2 2a
 0  0  2  0  0  2 2a+2 2a 2a+2  0 2a+2  0 2a  2  2 2a+2  2  0 2a+2 2a  0  2 2a 2a 2a+2
 0  0  0  2  0 2a+2  0  2 2a+2 2a 2a+2 2a 2a+2 2a+2 2a+2  0  0  2 2a 2a+2 2a  2  0 2a+2  0
 0  0  0  0  2  2  2 2a+2 2a+2 2a+2 2a  2 2a+2 2a+2 2a+2 2a+2  2  0  2  2 2a 2a+2  0  0  2

generates a code of length 25 over GR(16,4) who´s minimum homogenous weight is 64.

Homogenous weight enumerator: w(x)=1x^0+141x^64+234x^68+924x^72+2406x^76+156x^80+102x^84+84x^88+42x^92+6x^96

The gray image is a code over GF(4) with n=100, k=6 and d=64.
This code was found by Heurico 1.16 in 5.65 seconds.