"The 48-Hour Game Programming Competition is a "mostly from scratch", timed, solo coding challenge where all willing game developers spend their allowed time making the best game they can under a common theme.
The whole point of competing in the LD48 competition is to challenge yourself to write a game, from scratch, by yourself, in 48 hours. That's what we old-timers call the "spirit" of the competition.
If you've got a question regarding any of these rules - see whether thinking about the above statement will answer the question for you."
The competition starts at 05:00 this saturday and ends at 05:00 two days later (monday), swedish time.
sign up and more information at http://www.ludumdare.com/