The Bonus Stage (Bonus Phase, Bonus Round, etc.) is a recurring element of the Balloon Fight series, appearing in a majority of the games.
In the Bonus Stage, it most commonly is just a single, non-scrolling screen with four pipes in the stage. Twenty Balloons will come out one-by-one and you must pop all of them. In Balloon Fight (NES), the stage will appear in game modes A and B after every three stages completed, and you can get a "Super Bonus" if you collect all twenty balloons. In Balloon Kid, there will sometimes be Game Boy systems around some stages and you will be transported to a Bonus Stage if you walk into them. In these stages, letting one balloon pass the ceiling will end the stage and you will be sent back into the normal level. In Nintendo Land: Balloon Trip Breeze, there will be a Bonus Stage level at the end of Day 3: Morning, and another with eight pipes at the end of Day 7: Morning. In Vs. Balloon Fight the stages scroll vertically, with the pipes being considerably taller as well. Later phases also have more than four pipes. The Game & Watch version also has bonus stages, with a number of different variations. The bonus stage can have Balloons that either float upward or move diagonally and bounce, and a stage can also include either no Sparks, vertically bouncing sparks, horizontally bouncing sparks, or diagonally bouncing sparks.
In the original Balloon Fight (NES), the pipes are gray and the ground and balloon color changes depending on how many times you have gone into the Bonus Stage. In Balloon Kid, the screen can scroll vertically, and the stage is considerably thinner than usual, due to the smaller resolution of the Game Boy. In Balloon Fight GB, the color remake of Balloon Kid, the pipes on the ground are green. In Balloon Trip Breeze, the pipes are yellow and there is no ground or platforms, as well as a wider screen and no scrolling.
- The green pipes seen in Balloon Fight GB are likely a reference to the Super Mario Bros. series, and this may have been included because the group at Nintendo that created Balloon Kid, Nintendo R&D1, also created Mario Bros. and Super Mario Land 1 and 2.
- The Bonus stages in Balloon Trip Breeze are very similar to those from the Game & Watch game, since there is always water across the bottom of the level, and in both versions there are obstacles which appear later on in the game.
- The order in which the balloons appear is generated all at once, so using restore points, a player can try the same pattern of Balloons multiple times. This also means that the pattern in stages of NES Remix are constant.