Super Mario Bros X is a new(ish) mario remake. The thing that sets this game apart from others is...well everything. Co-op, battle mode against a friend, new power-ups, play as Link from Zelda, a level editor, new bosses, and all new levels based on ALL mario games released to date. Oh and that co-op I mentioned? Yeah pretty awesome. No longer are you stuck to not being able to move through the level until your partner catches up. When the two of you are close, it's full-screen. When you move apart, it goes to split-screen. Let's not forget the fact that there are level packs that you can download and install on top of the 50 default levels. Sorry, I've no time for screens but there is a great trailer you should watch on the download page to decide if this game is for you.
Download 37.5Mb HERE - link is 'Download Now!' on the page under Super Mario Bros. X 1.3