PrimeXTime-Lite vs Numbers Sigma Puzzle Usage & Stats

Numbers Sigma Puzzle is a minimalistic math puzzle game where you have to find the right combination of numbers on your screen. Your goal is to remove redundant numbers from the field. The sum of the remaining numbers in each row or column must coincide with the given numbers, which are indicated along the edges of the playing field. Click a number to remove it. Tap it again to return a deleted number to the field. Click and hold the number or double-click to lock it. If you know that a particular number needs to be used, you can lock it on to make solving the rest of the puzzle easier. "Solution" button is available without restriction. All the tasks are divided into 5 categories of dimension (5x5, 6x6, 7x7, 8x8, 9x9). Each group has 1000 levels. There are total (5x1000) = 5000 tasks.