AddNigma

The goal of the game is to place the numbers in the correct locations and fill the field. Once all the numbers inside along a row or a column add up to the number on the edge, the level will be complete.

Features:
- 6 field sizes (3x3, 4x4, 5x5, 6x6, 7x7, 8x8)
- 4 difficulties (Easy, Medium, Hard, X-Hard)
- Each difficulty introduces additional number choices to place in the field.
- 3 tools for puzzle solving (pen for permanent marking, pencil for "guessing", and an eraser for mistakes)
- Double click the pen icon and then touch a pencil number to convert it from pencil to pen (game will finish when all numbers are in pen)
- Double click the eraser icon to remove all numbers from the field.