How to enter into hidden maps in Overwatch

THIS WILL PROBABLY BE FIXED AUGUST 13TH, NEXT OVERWATCH PATCH. Discovered by Heavy Assault and Chsiung! (Code: AYDMC) Zezombye Za Hando Capture the Flag Workshop Mode: Thanks LazyLion for the map codes: FVYEP Havana(Storm Rising) Menu W0QNE Blizzard World Menu X00BV Blizzard World(Winter) Menu F8K50 Busan Menu Q5Z1A Château Guillard(Halloween) FFA Menu NAZPJ Brigitte Eichenwalde Menu 37