you can enter the amount of tickets you want, if you put in 1000 and then click minus it will drop to another number which is the block with the most tickets in (Block K with 372) if you keep clicking minus once another block becomes available you know that block has that many tickets left, so block L became available at 320 - 692 in total. Another 5 have sold in though so down to 687.How can you see there are 692 tickets remaining?