If the words Nintendo, Super Mario Brothers and Playstation bring a smile to your face and an itch to your trigger finger, you’ll go bonkers for this three-story fun house in Akihabara, the heartbeat of all things anime, manga and more in Japan. Filled to the gills with retro video games — more than 50,000 games in stock — and equipment, looking for your favorite is like digging for potatoes (yes, that’s how they got the name). What’s now a popular chain throughout Japan, this flagship is the heartbeat of geek culture, a celebration of games we obsessed over in the 1980s and 1990, including many titles that can’t be found anywhere else. Think: Famicom, 64, GameCube, Game Bo and so on. In addition to the arcade on the fifth floor, every inch of the place is covered with gaming-themed gifts, from toys to consoles, books, cartridges, stuffed animals and even video game soundtracks (in case you missed the sound Ms. Pac-Man makes). Wakka wakka.