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Super Mario 3D All-Stars

Hidden Star: Boo in a Box

Ben Chard
Jarrod Garripoli
, &
Seren Morgan-Roberts


This page offers a guide on the hidden level Boo in a Box, which is found within Bubble Blastoff in Deep Dark Galaxy.

Swim to the Bottom of the Lake

The first thing you need to do to get the hidden star is to swim to the bottom of the lake. This means you can just skip past the Undergrunt Gunner and head straight through the tunnel to the lake.

When you’re at the bottom of the lake, grab the green shell and shoot it at the ship wreck that is surrounded by spiky underwater mines. When you shoot the shell at the wreck, the mines will explode the wreck and reveal a Star Launcher. The Star Launcher will shoot you into the sky towards a purple and gold box.

Use a green shell to smash the ship wreck.

Power Star Boo

When you land inside the box, you’ll be greeted by a Boo and an Urchin. The Boo has a Power Star so you’ll need to figure out a way to trigger a spotlight to defeat him. On the backwall, use the spinning poles to jump up to the gravity arrow and then spin it so the gravity is now heading towards the left wall. When you’re on the left wall, groundpound the spring to jump up and spin the gravity arrow again. Whilst you’re making your way around this room, make sure you keep an eye on the Boo and the Urchin as they’ll make their way towards you in an attempt to hurt you.

Use the gravity arrows to make your way around the room.

When you’re on the back wall, you’ll need to use the spring to jump towards the gravity switch. You should time your jump so that you land into a bubble, then when the bubble is near the gravity arrow spin to flip the gravity arrow. On the right wall you’ll need to spin attack the crystal to reveal a spotlight. You can then lead the Boo into the spotlight by spinning him into it. When you’ve successfully defeated the Boo, you’ll need to use the spring jump to flip the gravity arrow back to default so you can grab the Power Star.

Defeat the Boo using the spotlight so you can grab the hidden Power Star.

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Guide Information
  • Publisher
  • Platforms,
  • Genre
    Action Adventure, Platformer
  • Guide Release
    24 September 2020
  • Last Updated
    8 February 2021
    Version History
  • Guide Author
    Seren Morgan-Roberts, Jarrod Garripoli, Ben Chard

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This guide for Super Mario 3D All-Stars offers a walkthrough for all three Mario classics.

Inside this guide you will find:

A 100% Walkthrough - For Super Mario 64, Super Mario Sunshine and Super Mario Galaxy.

A complete guide on Super Mario 64, including:

  • A layout of Peach’s Castle, with each course’s location pinpointed, as well as an overview of each course.
  • Walkthroughs for every star, including all courses’ 100-coin star.
  • How to get each of the power-up caps.
  • The location of every single Secret Star found in Peach’s Castle.

A complete guide on Super Mario Galaxy, including:

  • A Dome Overviews page outlining every galaxy found in each Dome.
  • Walkthroughs for every star, including hidden stars and comet stars, found in each galaxy.
  • A guide on how to unlock the Planet of the Trials galaxies.
  • Detailed coin-by-coin walkthroughs of Purple Coin levels.

A complete guide on Super Mario Sunshine, including:

  • Walkthroughs for every shine in every episode.
  • How to find every Blue Coin.
  • Strategies on how to secure 100 Coins on every Course.

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