The first released version of Super Mario Advance 4: Super Mario Bros. 3 in North America had came bundled with a few e-Reader cards. When the e-Reader was discontinued, this bundle was dropped. This set was never released in Europe.
The Orange Switch is an e-Reader card for use with Super Mario Advance 4: Super Mario Bros. 3. It was included in the Series 1 set of cards. Although technically a Power-Up card, the Orange Switch is labeled as a "Game Level/New Level" card. It can be used in both the main game and in World-e.
Once the card is scanned, any non-boss enemies that Fire Mario defeats with a fireball will turn into a coin, much like in Super Mario World. Compared to the effects of the other switches from Super Mario Advance 4: Super Mario Bros. 3, the effect of the Orange Switch is quite minor.
The Blue Green Switch is an e-Reader card for use with Super Mario Advance 4: Super Mario Bros. 3. It was included in the Series 2 set of cards. Although technically a Power-Up card, it was labeled as a "Game Level" card. It can only be used in the main game.
Once the Blue Green Switch is scanned, grass with turnips below appears all throughout the main game, and Mario can pluck them from the ground and throw them at enemies, just like in Super Mario Bros. 2.
Sonic 3: D.A. Garden Edition is a ROM hack of Sonic 3 & Knuckles created by D.A. Garden. It aims to be a "vanilla" but complete and fully featured take on S3K, with 23 acts of new level layouts matching the scope and size of the original game.
In 2020, a user named Thorn ported the hack to the Sonic 3 AIR project as a mod, allowing it to be played with the additional features AIR provides.
Teki Power Up! Tokuten x2!! is a Japan-exclusive Series 2 e-Reader card that is used with Super Mario Advance 4: Super Mario Bros. 3. It can be used in both the main game and in World-e. Its key artwork is dark green with a red outline of Bowser.
Once this card is scanned on the e-Reader, it makes all non-lethal damage power down the player to Small form (as in Super Mario Bros. and its derivatives, the Japanese version of Super Mario Bros. 3, and the original version of Super Mario World), replaces most of the enemies with more difficult ones (similar to the Hard Mode of Super Mario Bros.), and doubles the bosses' health. However, the points that the player receives are doubled, making the player's score accumulate much faster.
Sugu ni mantan! Power Meter!! is a Japan-exclusive e-Reader card for use with Super Mario Advance 4: Super Mario Bros. 3. It was released in Series 2 in Japan. It can be used only in World-e. The key art, similar to the blue switch card, was colored orange with a red outline of Raccoon Mario. The only difference between the two cards is that Mario is facing upright and pointing his left finger.
Once this card is scanned, the Power Meter is halved, making it much easier to run and fly throughout stages.
Timer yukkuri! is a Japan-exclusive e-Reader card that is used with Super Mario Advance 4: Super Mario Bros. 3. It was included in the Series 2 set of cards. It can be used only in World-e. The key art is light green and featured an outline of Toad.
Once this card gets scanned, the timer and music slow down for the first 50 counts, giving the player more time to complete a level. When 50 counts are past, the "coin" sound is played and the timer and music go back to their original speeds.
Luigi Power Up! is a Japan-exclusive e-Reader card in Super Mario Advance 4: Super Mario Bros. 3. Released in Series 1 in Japan, it gives Luigi his scuttle ability from Super Mario Bros. 2 and makes his fireballs bounce higher, as in Super Mario World: Super Mario Advance 2. It can be used in the main game, and in World-e (although it is permanently on by default in World-e, without ever needing to scan the card).
1UP Kinoko ga 3UP Moon ni kawaru! is a Japan-exclusive e-Reader card for use with Super Mario Advance 4: Super Mario Bros. 3. It was released in Series 1 in Japan. It can be used in both the main game and in World-e. Its key art was orange and featured a red outline of Raccoon Mario, specifically him crouching with his tail extended.
Once it is scanned, all of the 1-Up Mushrooms in the game become 3-Up Moons. This feature allows Mario and Luigi to accumulate extra lives more easily.