This cartridge contains four games. The first is a souped-up recreation of the original NES Super Mario Bros. game from the mid-1980's. Although Mario has had so many new abilities since then, this is still eminently playable and fun.
Then we have The Lost Levels. These were apparently in the original SMB1 too, but when the game went westward these levels were deemed too hard to include. When you play them you see some very nasty tricks in them, not to mention some very nasty jumps, reduced jumping space to make jumping on that baddie more difficult, poison mushrooms... Some people may find it more than their tolerance will...tolerate.
Then we have Super Mario Bros 2. This is actually a rehash of a game that initially had nothing to do with Mario; it is simply a game entitled 'Doki Doki Panic' with Mario-related graphics. Unfortunately the game is a bit weak compared to the other games here, especially with its flick-screen vertical scrolling.
And, finally, we have the superlative Super Mario Bros 3! This goes back to the classic Nintendo formula of Mario games and bestows the Mario brothers with new powers and a map screen to give them a bit of choice where they go. This game is too awesome for words, and is rightly a classic. If you haven't got this and you find it...get it! It's platforming heaven, platforming brilliance. OK, so even with the improved graphics over the NES originals the look still isn't jaw-dropping, but there are loads of things to do in the Mario series!