Namja Town is an indoor amusement park in Ikebukuro with Japanese-style haunted houses, interactive games, and themed food areas. The attractions are compact and playful rather than high-thrill, which makes it a useful bad-weather option for families.
It is easiest to treat Namja Town as part of an Ikebukuro outing rather than a full-day Tokyo destination. Check current opening hours and ticket rules before going, since individual attractions and food areas can change.