What's in the box? While there are many different references I could tie that line to, what matters about this particular white box is that it's the centerpiece of Tsuregemu 6, the newest escape game from Paradise Kung Fu and the direct successor of Tsure Game 5.2. (Whether it's "Tsuregemu" or "Tsure Game" seems to depend on your translator.) The goal's the same: point and click your way around the box, click the navigation arrows when they appear to change what you're looking at, use and examine inventory items, and eventually unlock the box's final secret: your key to freedom. However, this box is a huge step up in depth from its predecessor, with many more puzzles and secrets hidden inside it than originally meets the eye.
It's easy to see the jump in complexity when playing this side by side with the 5.x games; there's more to look at on this peculiar white box even before you start to solve anything, and the previous games didn't have or need "Teleport" buttons to skip over otherwise tedious segments of navigation. Yet despite this, this shouldn't be considered an intimidating box; there's no pixel-hunting as long as you know where you want to look (which, admittedly, isn't always the case), the progression from puzzle to puzzle is clear and enjoyable, and every puzzle is just clever enough without being too obscure. Overall, it's clear that the developer has taken a proven formula and expanded delightfully on it, resulting in a game that'll definitely be fifteen minutes well spent, give or take a few.