if you want to play the original.. there is an online java version.
http://www.gameszoo.org/zgame.php?gid=giana
there is also a ds version (though i have never played it)
http://galway.c64.org/gianads/
there was also a mario "hack" of the giana sisters for the c64. I remeber seeing this wayyyy back in the day.
http://www.youtube.com/watch?v=ZRU8bHzh0zE
http://www.gameszoo.org/zgame.php?gid=giana
there is also a ds version (though i have never played it)
http://galway.c64.org/gianads/
there was also a mario "hack" of the giana sisters for the c64. I remeber seeing this wayyyy back in the day.
http://www.youtube.com/watch?v=ZRU8bHzh0zE