Game played with mallet and 10 balls on the grass in your yard?

The game you're describing sounds like croquet. In croquet, players use mallets to hit wooden balls through a series of hoops (wickets) set up on a grass lawn, aiming to complete the course in the fewest strokes. Typically, the game can be played with 2 to 6 players, but variations may include more balls. It's a fun outdoor game that combines strategy and skill.