World 3 is the fourth set of boards in the Toad Scramble mode of Mario Party: Star Rush. They are unlocked by completing a game on World 2. World 3 features a birthday cake theme.
Some boards have a feature where a large amount of coins are dropped onto the middle of the cake halfway through the game. Some feature three Gold Bullet Bill launchers, and every turn a roulette is spun to determine which, or all, are fired. Characters are chased to the edge of the map and coins are left in the path of the bullet bills.
Board information
| Board | Preview | Description | Boss battles |
|---|---|---|---|
| World 3-1 | 
|
"This three-layer cake is garnished with coins!" | 3 |
| World 3-2 | 
|
"On this tasty confection, Gold Bullet Bills abound." | 4 |
| World 3-3 | 
|
"Tons of sweet toppings and tasty coins. Yum!" | 5 |