Throughout most of the level, there is mostly water and not much solid ground, and the ceiling is almost entirely made up of spikes. All of the terrain and the background seems to be made from the insides of the Whale itself. This level is the only appearance of the Fishbone enemies, which act like normal bird enemies. Since the level is an even number, the level ends with a boss fight with Robbie, a large lobster. As with all other boss fight levels, Jim can be seen floating away before the boss fight.
- Oddly, a similar level appears in Super Mario Land 2: The 6 Golden Coins, where the level takes place entirely inside a whale. It should also be noted that both Balloon Kid and Super Mario Land 2 were worked on by Nintendo R&D1.
- There is also a level which takes place inside Jabu Jabu, a large whale-like character, in The Legend of Zelda: Ocarina of Time.
|Balloon Fight (G&W)||Trip-Sky - Sky Metropolis|
|Balloon Kid/Balloon Fight GB||Alice's House - Pencilvania - Forest - Sea A - Whale - Sea B - Northern Sea - Cave - Secret Base|
|Common||Balloon Trip - Bonus Stage|
|Vs. Balloon Fight||Green||Orange||Turquoise||Blue||Yellow|
|1 - 2 - 3||4 - 5 - 6||7 - 8 - 9||10 - 11 - 12||13 - 14 - 15|
|16 - 17 - 18||19 - 20 - 21||22 - 23 - 24||25 - 26 - 27||28 - 29 - 30|
|1 - 2 - 3||4 - 5 - 6||7 - 8 - 9||10 - 11 - 12|
|Game & Watch||Phase 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16|
|Balloon Kid/Balloon Fight GB||Vs. Stage - Pencilvania - Forest - Sea A - Whale - Sea B - Northern Sea - Cave - Secret Base|
|Balloon Trip Breeze||Morning||Day 1||Day 2||Day 3||Day 4||Day 5||Day 6||Day 7|
|Afternoon||Day 1||Day 2||Day 3||Day 4||Day 5||Day 6|
|Evening||Day 1||Day 2||Day 3||Day 4||Day 5||Day 6|
|Night||Day 1||Day 2||Day 3||Day 4||Day 5||Day 6|