Every now and then your brain needs sum good challenges. The Alzheimer’s Association says:

Mental decline as you age appears to be largely due to altered connections among brain cells. But research has found that keeping the brain active seems to increase its vitality and may build its reserves of brain cells and connections. You could even generate new brain cells.

Sum isn’t the definitive end all of brain games, but it’s a great game to stretch sum of those cerebral synapses with.

The premise is fairly simple. There are 5 tokens with numbers on them. You must find 3 tokens. The first token is the one that the numbers add up to. The second and third tokens are the numbers that add up to the first token. From there it is pretty simple. You have 3 game modes that each has five levels of difficulty.

Sum Overview:

There are 3 game modes in Sum.

Classic: This mode gives you 90 seconds on the clock to score as high as possible. For each correct answer, you get 3 seconds added to the remaining time and points. The faster you answer the problem correctly, the more points you receive. If you answer a problem incorrectly, five seconds are deducted from the remaining time. You also only get 3 chances to correctly answer a problem.

Rush: This is very similar to the classic mode, except you get a flat 90 seconds on the clock without and deductions or additions to the clock.

Infinity: This mode has no clock period and will allow you to learn the mechanics of the game without the pressure of the time clock.

Sum setup

The game is very to easy to install. Just download it from Google Play and follow the prompts. You can sign in to Play Games as well, but it is not necessary to play the game. The developer Cyber Sky made sure to incorporate all the material design elements found in Lollipop. That ends up translating into a super easy to navigate app. They even added an extensive tutorial to help you understand how to play the game. I personally recommend that you take the time to read the tutorial. The concept of selecting the sum first can take a little getting used to.

Who will enjoy Sum

I’m not sure if I personally would call this game fun, at least not in the traditional sense. It’s more of a challenge than anything. The game features leader-boards, achievements, and Google’s Play Games integration. This is where the fun enters in a non-traditional sense. You can compare your scores against your friends that use the app and sign into Google. Good old competition can make any game fun. So if you enjoy competing with your friends, or just a good old challenge, then this game is for you.

What we liked

  • The mental challenge
  • Material Design
  • Play Games integration

Room for improvement

  • A leveling up system would make it more interesting


This is an enjoyable app and its totally worth the price, but you’ll want to invite your friends to play along with you or you might lose interest.

[pb-app-box pname=’cybersky.sum’ name=’Sum – Simple Maths Puzzle’ theme=’discover’ lang=’en’]

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