There is an ebay auction of an old Dutch secret annex board game. The auction is in Dutch, too. The best translation I could get verifies it is a board game, dated 1955. Apparently, most of the game takes place within the annex and Amsterdam, so it's not horribly morbid, but I'm not surprised the game did not catch on (at least I never heard of it before). The bidding ends tonight and has gone over 150 euros as I write this (early morning).