Letter Matrix

So you think working in a library is easy, huh? Let's put your Dewey decimal skills to the test. As returned books pile up, so does your stress level. So compile volumes wisely, and stash them away quickly. As the books fall you have to choose letters to spell words. Words can be created from any position in the stack. Longer words will gain you more points and clear the stacks faster. Clear each level by accruing the indicated point value.