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Undersea Dream in Mario Party 5 is a board map from the Dream Depot. It was created from dreams of the ocean. The flavor text in the instruction booklet references Twenty Thousand Leagues Under the Sea. Resembling a coral reef, the board is divided into two sections connected by bridges. Noteworthy features are the sunken ship, the whale, and the tiny shops set up by Cheep Cheeps. If a player lands on the Happening Space on the sunken ship, a dolphin swims out and forcefully takes the player to another part of the board. Landing on the Happening Space next to the whale allows players to be blasted to a space nearer to the Star; however, it is also possible to be blasted in front of the Star, meaning that the player will have to go all the way around the board again to get it. The Happening Space next to the Cheep-Cheep on the right-side reef let players get a chance to earn a Capsule, an empty can, or an old boot from one of the shells (with the latter two being worth nothing). Finally, the Happening Spaces next to the logs on either side of the board gave players a chance to ride a manta to the other side of the board and collect coins along the way.
Spaces
Party Mode
| Type of Space | Number of Spaces |
|---|---|
 Blue Spaces |
51 |
 Red Spaces |
9 (0 during the last five turns if the Red Spaces turn into Bowser Spaces) |
 Happening Spaces |
5 |
 DK Spaces |
1 |
 Bowser Spaces |
1 (10 during the last five turns if all Red Spaces turn into Bowser Spaces) |
| Total of Spaces | 67 |
Story Mode
| Type of Space | Number of Spaces |
|---|---|
| Blue Spaces |
17 |
| Red Spaces |
3 |
| Happening Spaces |
2 |
| DK Spaces |
1 |
| Bowser Spaces |
0 |
 VS Spaces |
2 |
| Total of Spaces | 25 |
Names in other languages
| Language | Name | Meaning | Notes |
|---|---|---|---|
| Japanese | アクア・ドリーム[?] Akua Dorīmu |
Aqua Dream | |
| German | Tiefsee-Traum[?] | Deep Sea Dream | |
| Italian | Sogno Acqua[?] | Water Dream | |
| Spanish | Paseo submarino[?] | Underwater walk |
Trivia
- Air bubbles are shown coming out of the characters occasionally during gameplay.
- The Happening Space with the Cheep-Cheep is one of the few examples in the entire Mario Party series where a character can get an item on the last turn (aside from doing an event themselves).
- This is the only board in Mario Party 5 with two capsule machines instead of three.
Template:Mario Party Board List