This is a classic. You've got just enough room on your table for 16 stamps. You've used up all your space, with only enough room to move your inventory around. Boy, you must be tickled to own so many stamps! Good luck in getting things organized.

GOAL: Order your stamps from 1 to 15, leaving the remaining space in the bottom-right corner.

Instructions: Move stamps into the available empty space by clicking on the stamp image. Try and order all your stamps so the first row runs from 1 to 4, the second row runs from 5 to 8, etc. In the end, you should have all 15 stamps in order, and your empty space should sit quietly at the bottom-right.