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Hello. Are you using PAL or NTSC... I tried both and any of these worked. And I also tried on a second C64 mini and I got the same results... I will re-download the rom game and try with different USB sticks. I will explain here my experience. Thanks a lot for your fast and kind response on my problem.

Sorry, it's solved. When I purchased the file it contains 2 rom files... the one that works perfect on C64 Mini Black edition is the file called motm.d64 The other one doesn't work. 
Thanks a lot for your fast response and sorry again for my misunderstanding. It's an awesome game!