The entire text of the puzzle is "This puzzle hunt has quite a few different kinds of puzzles. We have created a good mix of them - even this lipogram! (But no jigsaws, though.)"
A lipogram is a poem, novel, or other work (such as a puzzle) which conspicuously excludes one particular letter of the alphabet. This puzzle identifies itself as a lipogram, and indeed it is - it is missing the letter Y. Y is the answer to this puzzle.