The traditional garden games are croquet and lawn tennis. Childrens' play equipment and bouncy castles are challenging their popularity, especially in smaller gardens and for kids parties. Modern children like swings, slides, ladders, skittles, volleyball, table tennis, badminton, climbing frames, trampolines and, most of all, bouncy castles. Outdoor chess is both a spectator sport and a participant sport. Bouncy castles are less fun for spectators - but great fun for children. Outdoor ping-pong works very well in German Parks with a permanent table tennis board. In England, croquet is a traditional garden game (sometimes played in public open spaces, like Exchange Square).
Book on garden games
Portable bouncy castle
Outdoor chess game
Outdoor ping-pong table