Putting Challenge Details: 72 electronically changing contours, four 18-hole courses on two skill levels (2 Amateur and 2 Professional) Authentic Game or Challenging Practice. Green computerised keypad displays/announces player's turn, hole number, penalty strokes, average putts-per-player, and even cheers for a hole-in-one!! Patented sensor system keeps score - up to 4 players. Automatic "ball return" rolls the ball right back to your feet after every putt.