This is not a conventional theme park. The museum connects Nintendo's early playing-card business with its later toys, consoles and games, then turns part of that history into hands-on play. Its limited entry system makes it a route-defining reservation for many fans.
Plan it as a half-day in Uji rather than squeezing it between distant Kyoto sights. The official site asks visitors to use public transport, checks the named visitor's identification and separates museum admission from the optional same-day Hanafuda workshop reservation.