Insight

tl;dr: Play Understand first.

Insight is not entirely different from Understand — both share a minimalist style and a naming convention of choosing un-googleable titles. Compared to Understand, Insight leans heavier into testing your spatial reasoning. Insight is not executed as well: it's more difficult to experiment in Insight, since the game often fails to indicate whether you've broken a certain rule or not — unless your solution happens to satisfy a different rule first.

Insight doesn’t always test your understanding effectively. I sometimes reached the final level of a set with only a vague guess about how some of the rules were meant to work, even though I hadn't resorted to bruteforcing any of the solutions. It’s disheartening to find out that my assumptions were wrong all along after I've spent quite a while chasing a solution I thought should have totally worked. Sometimes solutions don’t count for reasons that feel arbitrary — like when your line turns at an already existing corner. If that’s never allowed, it shouldn't be possible to do so in the first place.

Nevertheless, the parts that do make sense are still very enjoyable (and there are plenty of them!). Given the low price and the generous number of levels, I still recommend the game — but only if you’ve already played and thoroughly enjoyed Understand.

gets pretty hard! but surprisingly fun. One of the better times I've had with one of these "rule discovery" type puzzle games.

该游戏是 Understand 的精神续作，玩家需要猜出 49 种不同的机制，但是机制之间又有着一定的联系，部分关卡的机制过于神秘了，后面的纸笔部分也有着一定的难度，但是猜出规则的一瞬还是很爽的！
The game is like "Understand 2", the player needs to guess 49 different mechanics. Some mechanics in the game is too confusing, but can you infer them from former experiences. The continuous "Aha-Moment" really makes me overjoyed.

A few mechanics I found really obscure, but the hint discussion thread was enough help to get unstuck. Overall though I could have the promised Insights on what to do, and on how to do it, given some time and taking some breaks. Recommended if you played games like Undertstand (which is the most similar), the Witness or Taiji and enjoyed what they do with rule discovery.