Number Chain - Logic Puzzle comes from Ecapyc Inc. It's the same game as Numbrix, popularized by Marilyn vos Savant in her column in Parade Magazine. 
I've played this game about 5 times.  I did notice that there are multiple solutions to some puzzles. But that's okay.  This is a fun game and it's free.https://apps.apple.com/us/app/number-chain-logic-puzzle/id1348153114
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