Overworked interface
Compared to the online version, this has a lame interface. Lots of fancy presses tpo do actions that could be very simple.
Not enough ratings yet to assess Numbers Sigma Puzzle.
Numbers Sigma Puzzle appears to be a legitimate app. AppsHunter Legitimacy Score for Numbers Sigma Puzzle is 80/100.
Based on 80 of 100 points across 7 verification signals from App Store and developer data.