For December 2013, I did an Advent calendar, posting one level a day until Christmas. These are those levels, compiled into three downloads. Since the filesize of all of the levels together exceeds 15,000 KB, I couldn't do a single download.
December 10: The Chute
December 11: Teleporter Labyrinth
December 12: Launch Tower
December 13: Game of Chance
December 14: Zero Gravity Field
December 15: Ice Slalom