1)Puzzles about getting a solution that follows a set of rules, which can be deduced, and are reused from puzzle to puzzle. The game just checks that the rules are followed, so there is more than one valid solution sometimes. The different solutions might even have different effects.
2)Environmental puzzles, where the right solution is indicated by the environment. Without giving too much away, imagine that there's a line near the puzzle, matching the puzzle's grid, and the solution is just to trace that same line in the puzzle.
So there's never an arbitrary rule that you can't figure out. That said, a part that is difficult for some people is that they make assumptions about what the rules of the puzzles are, and the assumptions might be incomplete, or outright wrong. There's typically simple puzzles that are trying to teach you the rules. Part of the game's progression is to find those tutorial puzzles.
1)Puzzles about getting a solution that follows a set of rules, which can be deduced, and are reused from puzzle to puzzle. The game just checks that the rules are followed, so there is more than one valid solution sometimes. The different solutions might even have different effects.
2)Environmental puzzles, where the right solution is indicated by the environment. Without giving too much away, imagine that there's a line near the puzzle, matching the puzzle's grid, and the solution is just to trace that same line in the puzzle.
So there's never an arbitrary rule that you can't figure out. That said, a part that is difficult for some people is that they make assumptions about what the rules of the puzzles are, and the assumptions might be incomplete, or outright wrong. There's typically simple puzzles that are trying to teach you the rules. Part of the game's progression is to find those tutorial puzzles.