There are various in-game mini-games that you can play. In these games, you can integrate the photos you took with the Game Boy camera and plaster them on the faces of the characters. For example, in a balloon, you can replace the character's face with yours.
Ball
This is a remake of the very first ball game released in 1980. In this game, you take four photos of your face and throughout the game the character's face will alternate between the four photos you have taken. In order to play ball, you are required to shoot the spaceship with a "B" (for ball) on it in the space fever game.
DJ
This is a game that can be accessed by shooting a spaceship with a "D" on it in space fever. In this game, you can create a melody by pressing the select button and d-pad. Once you have created your song, it can be heard in the game's main menu. The face of the DJ can be changed in the game menu. Face 1 is a guy, face 2 is a girl with a hat on her head and a face ? it's your face. Most do not consider it a game, but just an application.
Space Fever II
Space Fever II is the successor to the 1979 arcade video game Space Fever, which was developed by Nintendo R and D1. This is a game where you can access the two titles above. At the start of this game, two ships will drop marked "B" and "D". If you shoot "b" you will be redirected to the ball game, and if you shoot "d" ship you will be taken to the DJ. If you don't shoot, then you can play Space Fever II. In this game you will shoot at oncoming ships. The first shot will only have one bullet, while the second will have two. After that, the template will be restarted. It's wise to use this pattern, as the ships usually come in twice, which will give you the opportunity to take out both at once. Bosses have real people's faces
Run! Run! Run!
In this game you will race against a groundhog and a bird. The mole is usually faster than the bird, but sometimes it is not. To play this game, you must quickly press the A button in order to run, while jumping over obstacles when you stumble upon one by pressing the B button. Before starting the game, you will be able to choose between three persons. Two of them are pre-recorded, and the third one, which is marked with a question mark, is your face. To play Run! Run! Run! You must accumulate a total of 2000 points in Space Fever 2. After you win the game, you can raise the flag with the letter "N" on it (presumably while standing for Nintendo) by quickly pressing the A button.