The game machines of all ages are netted together, without admission tickets, and then interact with the game at a fee. Such a game room, called the Toy Machinery Museum in San Francisco, has creative ideas.
There are no tickets, but most places still have to pay, so it's not really free. It's really interesting here. You can see some mobile exhibits and some interactive activities!
Natalia_Snow: 機械博物館附近有這幾間酒店:舊金山馬奎斯聯合廣場萬豪酒店(San Francisco Marriott Marquis Union Square),漁人碼頭假日酒店(Holiday Inn Fisherman's Wharf),漁人艾優碼頭酒店(Hotel Riu Plaza Fisherman´s Wharf),舊金山聯合廣場萬豪酒店(San Francisco Marriott Union Square),舊金山聯合廣場聖弗朗西斯威斯汀酒店(The Westin St. Francis San Francisco on Union Square)