didn't see a thread for this here and i think everyone know how useless the comments sections are for this kind of thing (you'd probably never find these codes there).
its a set of 5 cards (1, 2, 3, 4, 5) which depending on the time and order you input give a different reward every day with...i think its a 60 minute expiration time for each code so be quick with them.
anywho, heres mine for today at 3:00PM 1, 5, 3, 4, 2 (simply click the above cards in this order). this code gives Cl2KrNa2 Diagram and expires in 54 minutes