Description

Very simple arithmetic, very difficult puzzle game.
Zero Ending only using addition and subtraction arithmetic.
There are currently 1024 levels waiting for you to challenge. The new levels coming soon.

# How to play
Draw a line from left-top to right-bottom, all of number sum must be Zero.

# Tips
When the sum of the numbers in your line is a positive number, the next number should choose negative number.
When the sum of the numbers in your line is a negative number, the next number should choose positive number.

# Indicator window
When you draw a line, indicator window show the sum of the numbers.
The blue cell means: it is best choose for next number.

# Challenge (Facebook)
The challenge mode is a "Asynchronous Competition". You send your game data through Facebook to your friends, and they can play the same game again. Because you are play the same game, so which one has high score is winner.

# Auto save
When you exit the game, it will auto save the last status.
When you launch the game, it will auto restore previous status.