Modifications by Jill, Leah, Lauren, Ashley, Megan, Nick, Jenn, Alyssa (Preservice geometry K-8 class) and myself.

*Game*:

**Coordinate Connection**

*Materials*: 10x10 grid with no axes, pen (or colored writing utensils)

*Gameplay*: The idea of the game is players take turns naming a coordinate pair and then filling in the point. The first player to make four in a row, wins.

The first point of the first player is the origin, (0,0). It still counts as their point and can be one of the four in a row. Later points are given by naming a coordinate pair. For example, (2,-3), is two to the right of the origin and 3 below it.

Players take turns naming a point and then marking it. If it's not where you thought, too bad, so sad, that's where it goes. (Unless another point is already there - lucky.) If players are having a tough time just verbalizing it, they can be required to write the coordinates down before drawing the point.

The winner is the first player to get four in a row, vertically, horizontally or diagonally. The loser decides whether they want to go first or second in the next game.

*Hints*:

- consider blocking your opponent from getting three in a row.
- get and stay on the offensive
- use a special mark

*Variations*:

- Play with three or four people. (This was surprisingly fun and complex.)
- Allow any 4 consecutive collinear points to win. For example, (-3,-3), (-2,-1),(-1,1), and (0,3)
- Play with younger students by giving directions from home, such as 2 left and 3 up.
- In the original game, you marked the point then said the coordinates, losing it if you were incorrect.

Paper for playing - 2 sided, 4 10x10 grids each side.

Sample game:

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