The LEGOLAND Discovery Center in Odaiba is the indoor, pint-sized cousin of the Nagoya park: a couple of hours of build zones, a 4D cinema, two small rides and a Miniland Tokyo in brick form, all pitched at kids roughly three to ten. It is not a theme park and does not pretend to be; as a half-day indoor play stop it does its job well.
Adults generally cannot enter without a child, which tells you the target audience precisely. Weekday afternoons are calm; wet weekends fill with local families. Timed e-tickets run cheaper than walk-up.
Odaiba Kaihin-koen station on the Yurikamome, inside DECKS Tokyo Beach, next door to Joypolis, which conveniently covers the older siblings.
How long? Two to three hours.
Versus LEGOLAND Nagoya? This is an indoor centre, not the full park. Manage expectations accordingly and small kids will love it.
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