Mario Bros. (Game Boy Advance)

Mario Bros. is a Game Boy Advance game included in every Super Mario Advance game, as well as Mario & Luigi: Superstar Saga (only in the original Game Boy Advance iteration, making it no longer included in the 3DS remake).

Gameplay
All of the Super Mario Advance games and the original Mario & Luigi: Superstar Saga game can connect to each other to play the Classic or Battle mode with up to four players. The Classic mode is based on the co-op mode from the original and uses the Japanese arcade phase system. The Battle mode is based on the Battle Game from Super Mario All-Stars. The remake also uses the Game Boy Advance's Single-Pak multiplayer feature. It can connect and play with other Game Boy Advance systems without the game, although the Battle mode is the only multiplayer mode that can be played in this way.

Mario Bros. enhances the graphics to take advantage of the Game Boy Advance's 32-bit capabilities, including adding backgrounds to the stages. Music is added where it was originally absent, and voice clips are added in single-player mode. Jumping onto floors has been made easier; midair turning is allowed, unlike in the original where Mario or Luigi had to stay in one direction during jumping. The Power Squat Jump from Super Mario Bros. 2 has been added, and the Bonus Stages are now noticeably easier than they were originally. There are also two POW Blocks per phase set, and they can be picked up much like in Super Mario Bros. 2. Players can also pick each other up and throw them.

Enemies
Target enemies must be defeated to clear the phase while other enemies should be defeated by the player's discretion. Each phase consists of one or two types of targets with a maximum of six targets. Spinies and Sidesteppers appear together only in Phase 6. The last target enemy will always move at its fastest pace unless said enemy is a Fighter Fly.