Motocross Madness certainly doesn't have the same quality of graphics that MM2 has... but it's still a lot of fun, and it's free!
There's only two zones you can ride in - because this is the trial version. You can let loose in the stunt quarry, which is a large, open area with big walls for launching yourself into oblivion. And there's the national race track, which you compete against other riders for the title.
In both stages you can select how many riders you race against - the time limit, or the amount of laps, and also change your rider and bike.
There are multi-player options where you can race against other people over the internet if you're keen.
One thing that cracks me up is the sound of the bike when you land from jumps... it sounds like a gunshot! Funny cause I've never heard any noise that even slightly resembles that when riding dirt bikes?!
The download link seems to be forever changing - so you're best to google 'motocross madness download' to find the latest one. Once you find it, it's quick and simple and doesn't use up much space on your computer. So, if you've got nothing else to do go ahead and download it and try pulling off some tricks that you can't do on your own bike!