What is a 7DRL?
A Seven Day Roguelike is a roguelike created in seven days. This means the author stopped developing it 168 hours after starting.
The idea behind 7DRLs is forcing developers to finish a showable product instead of adding features endlessly to their grandiose, never to be released projects, a common pattern in the roguelike development world.
Incidentally, they are also useful as a way to test new ideas as non-traditional, experimental, scrapable roguelikes, thus allowing the genre to expand beyond its barriers.
You are welcome and encouraged to write a 7DRL anytime you want, as a great exercise to increase your odds as a sucessful roguelike developer; however, in 2005, the roguelike community established a yearly event, the 7DRL Challenge, in which all the world is challenged to create a roguelike in a one-week span.
The annual event occurs during a week in late February or early March. There is a chance that some other challenges may arise out of schedule, thus allowing more than one challenge per year.
7DRL Challenges are NOT about being a /fast/ coder, but rather proving you can release a finished, playable roguelike to the world. There is no winner of the challenge, but rather all those who finish are honoured for their work, the criterion is completeness.
How to participate into the challenge?
To the date, there have been six 7DRL challenges
Links of interest