A simple iOS puzzle game that is devilishly fun to play. Just add positive and negative numbered blocks to one another to make all zeros.

• Easy to play: swipe blocks left, right, up, or down
• Lots to do: 120 levels and counting...
• Never the same: new levels bring new kinds of blocks

What’s New

Version 1.1

This app has been updated by Apple to use the latest Apple signing certificate.

• added 18 new levels for a total of 120
• updated some beginning levels to make them easier
• bug fixes

Ratings and Reviews

4.8 out of 5
16 Ratings

16 Ratings

Ratty. ,

How a puzzle game should be!

Very good. Starts simple and introduces new features gently. One nice touch is that, if you fail, you can step back rather than having to completely start again. Also there is a feature that lets you skip the odd level if it's too hard. For example I could not solve level 114 for ages.

When you get to the end, you have to do the levels you skipped. But by then you have had more practice.

We need more games like this!

055000 ,

A bit too easy

I finished it in a day but less intelligent people will find it challenging

Bumpy 123 ,


Excellent kept the brain occupied for a few hours.

App Privacy

The developer, SaturnBoy, LLC, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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