Putter Golf is a miniature golf game released exclusively through the Japanese MegaNet online service. The game required the Sega Toshokan ("Sega Game Library") cartridge and Sega Mega Modem peripheral to access, and was the first game to be distributed via this method.
The game presents an eighteen-hole course filled with obstacles and traps that the player must surpass to hit par for each hole. For each point above par, the player loses a life, and for every point under par they gain one - the goal being to finish the course before losing all lives. Before taking a shot, the player directs their ball's trajectory with the help of a dotted guide, and then applies power to the shot by stopping a rapidly filling and draining power gauge at the desired level of force.