Guides
What I've learned about solving Suguru (or Tectonic, or Number Blocks), most of it while teaching a computer to do it. If you just want the rules, the quickest way is to solve a tiny one on How to play.
Suguru for beginners
The two rules, the mistake nearly everyone makes at first, and a small puzzle solved one step at a time.
Suguru solving techniques
Six ways to make progress, from the only number left to a short what-if, each with a worked example.
Suguru vs sudoku
What carries over from sudoku, what doesn’t, and why the two feel so different to solve.