Sky Field (com.lilypie.skyfield) on Google Play
Sky Field is a maths puzzle game where you aim to reach the target number from the 6 random numbers supplied. Just like the "numbers" part of the TV show "Letters and Numbers" or "Countdown" you can choose your number combinations from big and small numbers.Soothed by the gently scrolling sky field you may be surprised at how solvable problems become. Once you get on a roll it is very rewarding. Sky Field is free to play and there are no Ads. For $1 (one US dollar) you can unlock 16 Achievements as well as the Statistics sections of the game. This is a one-time purchase and the only in-app purchase in the game.