MegaMario is a clone of the famous Nintendo platform game from the 80s. The main difference is that this time it's not the Princess who's in trouble, but Mario's brother Luigi.
Another addition to the original is the really bizzare inclusion of blood effects. When Mario dies, in MegaMario he explodes like a firework or blood! Very strange indeed. Otherwise, the game plays exactly as you would think, although the movement doesn't feel quite as precise as in the original. The music is a live piano version of the well known original soundtrack, that doesn't have the same charm as the original 8-bit tunes.
The difficulty level is also somewhat higher, making the 25 levels included quite a mountain to climb. Graphically it's certainly an improvement on 25 years ago, but not up to the standard of Nintendo's recent DS outing.
Unfortunately you can't play it in a window, and while there is a level editor, it's quite awkward to use. Although the gameplay is quite faithful, the experience feels somewhat amateurish, especially compared to the highly polished official releases.
If you're a massive Mario fan, you'll either love the chance of playing it on your PC, or hate it for being a little different.