|Some of the differences I really like about the GBA remake over the original:|
- The koopa shell actually bounces off walls now instead of disappearing. It makes it more risky to use because it can kill you, but since it gives you a heart for every enemy you kill with it, it can allow you to refill your health pretty easily if you use it the right way.
- Every stage has 5 "A" coins, similar to the Dragon coins in SMW, which gives the game some extra replayability. None of them are very hard to find, but you sometimes have to go out of your way if you want to get 100%.
- Hearts appear a bit more frequently in this, with every boss battle having at least one floating heart at the beginning of it, but they become less frequent at later levels to keep the difficulty going up at a fair pace.
- There's also the "Yoshi Challenge" that adds even more replayability after you beat the game. You have to find 2 yoshi eggs hidden somewhere in the potion world of each stage. it's kind of tedious without a guide though, there's no kind of indicator to help you find them, so if you drop your potion at some random area and don't find an egg, you have to restart the level in order to search again.
The only downsides to the GBA version are the annoying low quality voices and the smaller screen area.