Burpee is a baseball game which requires a wall and does not require a catcher. You can play at your local playground or whereever there is a large open space with a wall. You'll need to determine locations for 4 bases (including home plate) and decide the out-of-bounds lines for foul balls. The home plate should be a few feet in front of the wall. Each team should have an equal number of players. You'll also have to determine a strike zone. This is done by drawing a retangle or square on the wall with some chalk to determine whether a pitch is a strike or a ball. Each team needs a pitcher. You'll also need to determine the distances a ball must travel in the air to constitute a singe, double, triple or home run. For example, a ball which travels only 5 to 15 feet might be a single, 15-25 feet a double, 25-35 feet a triple and 35+ a home run.
Burpee is played like regular baseball. If a pitch is inside the strike zone on the wall, its a strike. Otherwise it's a ball. Three strikes is an out and four balls is a walk. Three outs on both sides constitutes an inning. A caught ball is an out (regardless of whether you use a glove or not) and distance of the ball determines a single, double, triple or home run.