#GOG just made acquiring the recent freebie Robbo dependent on owning its remake Robbo Millennium. Fair enough, except they did a similar thing before where getting OpenTTD became dependent on owning Transport Tycoon Deluxe. I could ignore one case, but with two it's a pattern, so I need a new relation type to account for that when displaying grouped products in #GameSieve. Easy enough, except for the naming... (I settled on "unlock" / "unlock bonus", as short enough while still being understandable, but not really happy with it. Why couldn't this new relation just require some easy cache invalidation challenge?!) :P