Secret Aquarium
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The Secret Aquarium is a secret stage accessed by entering the hole in the wall on the right side of the JRB room. It consists of a room fully filled with water; it contains 40 yellow coins that can be used to refresh Mario's air. There are also 8 red coins that must be collected to spawn the star. It is the only stage to have an (albeit implicit) time limit, as you cannot surface and there are a limited amount of coins.
| The Secret Aquarium | |
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| Course Info | |
| Abbreviation | SA |
| Terrain | Water |
| Setting | Day |
| Water | All |
| Course Items | |
| Coins | 56 (  ×40 •  ×8)
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| Enemy Coins | None |
| Stars |  ×1
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| Star Navigation | |
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| Overview | |
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Coins
| Location | Count |
|---|---|
| 4 coin rings around 4 of the red coins | 32 |
| Another coin ring above the star marker | 8 |
| 8 red coins | 16 |
| Total | 56 |