# Addition/Subtraction

You've heard of addition by subtraction, but this game is subtraction by addition! Remove blocks by summing them up.

Keep adding up to 9 before time runs out! Can you chain combos and unlock all the tiles?

Take Sudoku off the grid! Each level is a new shape waiting to be solved.

Can you zero out? Remove blocks with addition and subtraction. Keep track of the numbers and keep your board clean.

Exercise your mathematical mind! Use four numbers and the four basic operations to make 24. Find the solution to earn a gold card.

Explore a huge mathiverse, chock full of equations. Grab the right numbers, watch out for traps, and hit the target score!

Zero everything out! Use addition, subtraction and clever placement to clear every tile.

Pick and choose the right numbers for the overlapping boxes. Can you hit all of the target numbers?

Hurry up, the clock is ticking! Find numbers that add up to the target and send them tumbling off.

Try out a new twist on Sudoku! Add dots to the hexagons to make the target numbers.

Connect tiles to output the right sums. When you have everything just right the tiles will all light up!

Swap cards to get the high hand! Can you knock out your opponents and win the game?

Find a route to the target number! Slide your number around the board. Use the operations at just the right time.

Calculate and connect! Use a little math and a lot of planning to connect the numbers and hit the targets.

The dice are all over the place! Push to combine them until they all add to 6.

Here's a number... how quickly can you get to it? Write the equation using fewer numbers for a bigger coin reward.

Try to hit the target number in this game about adding! Connect the numbers with a line until you hit the target. For a harder challenge, try the 4x4 grid.

Arrange numbers on the grid to cancel the larger numbers out. Plan ahead and put the numbers in the right place!

This is like our game, Twins, but we put numbers on the balls. You have to match up numbers (like in our game Shisen) to make the correct sums.

I've played this game until my arms were sore. It's great arithmetic practice while you get to shoot stuff. Can life get much better than that?

Compete against the computer to see who can pick numbers that add up to 15 first.

This is just like our Marble Lines game, but we've made it an addition game. You have to shoot the ball that makes the right sum.

Drag the square number tiles over the round number tiles to reduce their value to 0. Great for sharpening up your addition and subtraction skills!

Stack the colored orbs so that they add up to 21. How long can you last? Good for practicing your addition skills!

I thought this was impossibly hard at first. The key is to fill in all single squares first, then look for doubles and up. Cool that you can ask for hints!

This is a Pac Man type game, but you have to eat the monster that solves the math equation.

In this timed game, how fast can you pick out numbers from the grid that complete the missing spots in an equation?

Click on the fraction squares to make pairs that have a sum of 1... and do it as fast as you can!

In this game, you're given an arithmetic problem to solve... Once you find the answer, you have to find it on the grid of numbers - like in a word search game.

A head-to-head arithmetic showdown. Gain XP and level up. Ready, set... clash!