It turns out, you really can't go back. These games require a ton of grinding that just isn't worth your time as an adult. As a kid with nothing better to do you don't remember it that way. But as an adult, if you're honest, this just feels like a tedious time sink. If you really want to play it, grab the original ROM on a NES emulator where you can skip the tedium.
Also: the mobile controls are TERRIBLE. Most of the game will be playable but frustrating--be prepared to enter a level and leave and enter and leave etc because the directional pad is so poor. But other parts of the game that require fine control, like pushing rocks or avoiding holes, is flat out obnoxious.
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