The deal

Thirty days. Two thousand in whatever the locals call money. Five and a half thousand owed to somebody who charges ten percent a day and does not care how your week is going.

Six drugs, six districts, and a price for everything that changes every single day. The dear one barely moves within its range; the cheap one swings six-fold. Buy where things are cheap, carry them somewhere they are dear, and try to be holding cash rather than product on the day the law decides to take an interest in you.

Choose where you work before you start: New York, Tokyo, Paris, Moscow, Beijing, Vesta Station, Thebes, Perdition. Five of them are 1984. One is a company rock in the asteroid belt, one is Thebes under Ramesses II, and one is a silver camp in 1878 with no law closer than six days' ride.

Different streets, different police, different names for what is in your coat — and deliberately identical odds, so one leaderboard still means something. The grain-lender in Thebes compounds at exactly the rate the loan shark in the Bronx does.

No account required — you can play as a guest and your game will still be there tomorrow. Registering only adds a profile, lifetime statistics, and your name on the leaderboard instead of whatever you type in the box.