It Was A Hit! Battleship Coordinate Planes 4th-5th

Here's a very simple game for practicing naming points on a coordinate plane.  Each student gets a grid and creates 4 points.  They guess points of a partner, whose paper they cannot see.  The partner x's bad guesses or circles correct guesses and says, "Got me!"  The first person to guess the four points of their partner wins.
So that means the teacher is freed to check on the game and see if the students actually are using (x,y) coordinate concepts in naming their points or calling the points in the game.  Game boards are collected and students had to make points and label them along the bottom anyway.  So, there's a second way to check that students have successfully done the (x,y) pattern on their own.  Besides the fact that they have partners to work with, there are two ways to determine mastery of describing points on a coordinate plane.

I'm going to try this idea with quadrilaterals and triangles as well.  It was a hit!  Pun intended.