The block puzzle is the most copied format in casual gaming and one of the least understood. Its variants look different and share one structural idea that has not changed in forty years.
The original problem
Fill a row completely and it disappears. That is the entire mechanism, and everything interesting about the genre comes from its consequence: the board is a resource that you spend and occasionally get back.
Falling-block versions added gravity and time pressure. Wooden versions removed both and discovered that the format works just as well without them, because the real tension was never speed — it was the gap you left behind.
What the 10×10 boards changed
Giving three pieces at a time instead of one changed the game from reaction to planning. You can see what is coming, which means a lost board is your fault rather than the game’s, and that shift is why the format spread so widely on phones.
It also introduced the specific decision that defines modern block boards: which of the three shapes to spend first. The one you leave until last has to fit whatever space the other two created.
Why hexa boards are genuinely different
Six directions instead of four sounds cosmetic. It is not: on a square grid you can hold a mental picture of the empty space, and on a hex grid most people cannot. The planning horizon shortens from three moves to about one and a half, and difficulty rises without any rule changing.
That is the clearest example in the genre of geometry doing the work that rules usually do.
What has never changed
Across every variant, the winning habit is identical: look at the empty space rather than the pieces. Beginners ask where a shape fits; experienced players ask what the space can still accept, and place accordingly.
Forty years of variants have added timers, boosters, missions, adventure maps and three dimensions. None of them changed that, which is a reasonable definition of a format that got the core right the first time.
