Description: Challenger (bowling alley), Bally, 9/59, 4" balls. Has "lucky strike" and regulation bowling games. Lucky strike is operator adjustable (occurence high, moderate or low). At anytime during the game the player can flip the "lucky strike" switch and the player can make a bad shot and still be awarded a strike. Good feature for a game of adults versus kids, so a bad bowler can be awarded a strike for a bad shot.