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consider that maybe the red color indicates missing space...

ah! yes thank you. that did the trick. I tried to brute force it, but since the numbers weren't showing up in the safe digital display I couldn't tell if it was accepting any number. I guess I played too many different games in a row and my brains were a bit mush. Solid game of the genre. 

(+1)

I figured that but still never could get it right