Croquet is a fascinating game requiring good eye to hand coordination. A full sized lawn is 28 yards by 35 yards with at least a further yard all around for mallet swinging space. However, 10 m by 12.5 m is fine for beginners to become familiar with the tactics and techniques. The local U3A play enthusiastically on my small lawn.
An excellent site to find out more about Croquet is at http://www.oxfordcroquet.com/