Super Mario Bros for Android 1-3 is a port of the the classic Mario games that really recreates it perfectly.

It has a menu to help you travel to each of the 3 games and all the games look like you would expect. The game is played with your device sideways so that you hold your device like a controller. The controls are transparent making it easy to play without being distracted by them. It's so well done, you'd think it was an official port.

Of course, nothing is perfect. Many of the secrets, or Easter eggs originally found in Super Mario Bros seem to be missing. Also, Super Mario Bros 1-3 for Android does have browser based ads that can be annoying.