You can make a volleyball four square game with basic materials from the hardware store for about $20! This is a very quick and easy project.
4 - 1x2 @ 8 feet long
100 feet of rope
8 tent pegs or stakes that can be pounded all the way into the ground
1x2s do not need to be cut, drill holes every 6” from top down, 3-4 holes
2 - rope pieces @ 14”
cut remaining rope in half, then in half again, for four equal length pieces to be used as the staking ropes