Plus/Minus Number Game

添加并直至达到零减去的数字。

Reduce a set of numbers to 0 by alternately adding resp. subtracting any two of them.

* Over 200 levels from very simple to pretty challenging!

* Undos and Hints available for when you're stuck.

* Earn more hints by solving levels.

HOW TO PLAY

First, select a level you want to play, from the grid. The difficulty increases from left to right and from top to bottom.

In the game screen, tap any two numbers to select them. You can de-select a selected number by tapping it again. Note, that the first number you select is marked with an extra border. That's because the order is relevant for subtraction, as 2 - 1 is not the same as 1 - 2.

When you have selected two numbers, tap the operator button to perform the operation. This adds, resp. subtracts the selected numbers and the result is set at the place of the first selected number. After the operation is performed, it changes from addition (+) to subtraction (-) and so on.

The level is solved, if only one number tile with 0 is left.

You can undo one operation, but not more.

You can ask for a hint, as long you have hints left.

BETA

This is a beta version, and all your feedback is very welcome. If you encounter any difficulties, please don't be too harsh with the rating, drop us an email instead and we'll be happy to smooth it out.