Zero Sum is a unique number puzzle game with an action movie storyline.  It's like Sudoku and Die Hard had a weird baby.

 
 
 

The goal of the game is to get each equation to equal ZERO.  

 Click a blank space between two numbers to place a "plus" or "minus" sign!

Click a blank space between two numbers to place a "plus" or "minus" sign!

  Each operator you place changes the equation!

Each operator you place changes the equation!

  When the equation equals zero, you've won!

When the equation equals zero, you've won!

 Puzzles get more complex as you progress, and new puzzle types are introduced!

Puzzles get more complex as you progress, and new puzzle types are introduced!

 
 
 

You play as Sarah Jacobs, a Graduate Student working at Cleveland University's Math Department.  On the eve of discovering a mathematical cure for cancer, your mentor is murdered by a terrorist organization.  Before dying, your mentor managed to erase pieces of the equation (namely all of the plus and minus signs).  Now it is up to you to re-solve each of the equations, and cure cancer - before the terrorists do!

 Live action cutscenes tell the thrilling, action movie story of Zero Sum.

Live action cutscenes tell the thrilling, action movie story of Zero Sum.

 Solve the equations and cure cancer...before the terrorists do!

Solve the equations and cure cancer...before the terrorists do!

 
 
 

"Zero Sum is the greatest game ever made."

- Sean Vanaman (CEO, Campo Santo - Firewatch)

"Zero Sum is the greatest game ever made."

- Tim FitzRandolph (VP of Creative, Disney Mobile - Where's My Water?)

"Zero Sum is the greatest game ever made."

- Sean Krankel (CEO, Night School - Oxenfree)

"Zero Sum is the greatest game ever made."

- Alex Seropian (CEO, Bungie / Wideload / Industrial Toys - Halo, Guilty Party, Midnight Star)