Yesterday I tried http://arweave.net/byT7l6tkFq8mzqshwmju8fVi1rp8H9mYanlxzsJ7RjQ but someone was faster and claimed it while I figured only 6/7 answers.

Today there is a new one: https://arweave.net/xVkCRgFOaI2bS25J-FlAcJe0KOCp6VXqtREVyny7JpY not claimed yet, but it seems harder.