Around the launch of the Game Boy Advance Nintendo started to release the Super Mario Bros on the handheld. Starting with Super Mario Advance which was a re-release of Super Mario 2 with some added features the list goes like this.
Super Mario Advance = Super Mario Bros 2
Super Mario Advance 2 = Super Mario World
Super Mario Advance 3 = Super Mario World 2: Yoshi's Island
Super Mario Advance 4 = Super Mario Bros 3 (Yeah that makes sense!)
Anyway, all the games had added content and a few new games modes to make the price of rebuying these old games make sense. Well SMA4: SMB3 had what some are now calling the best add on of all of them. It used the GBA's e-reader peripheral to read trading cards. These cards would let you add new content into the game. Some of it was from past other Mario game and then some of it was exclusive to this release. It's like Nintendo took the best Mario game and just added the best stuff from all the other Mario games to make the ultimate Mario game. What I don't get is why this is a big deal all of a sudden. I don't remember anyone making a big deal out of this feature when the game came out and I certainly wasn't aware of what was in the game. If I had known this I would of bought an e-ready and tracked down all the cards. What I'm excited about is if someone comes up with a way to hack this version with all the added stuff and we see some crazy hacks like we see with Super Mario World.
Here's a video that shows all the added stuff you could of had. It does look really sweet and I would love to try SMB3, my favorite game of all time with all this added stuff.