Riddle School 3 puzzles are more complex than the original, but they follow the same logical principles. Here is how to work through them without resorting to a walkthrough.
Map the puzzle chains mentally. When you find a locked door or blocked path in Riddle School 3, note what you need to open it. Then look for that item or mechanism. If that item is also locked behind something, note that requirement too. Building this chain backward reveals the sequence of actions needed.
New areas often contain both problems and solutions. When you enter a new room in Riddle School 3, look for items to collect and obstacles to note. The item in one room frequently solves the obstacle in the previous room, creating a back-and-forth exploration pattern.
NPC dialogue is more important in this installment. Characters in Riddle School 3 give more specific hints than in the original, sometimes directly telling you what they need or where something is hidden. Exhausting all dialogue options with every character saves time in the long run.
Item combinations are introduced in this game. If two items in your inventory seem related, try combining them. Riddle School 3 does not have many combination puzzles, but the ones it has are not obvious without experimentation.
When stuck, check your inventory carefully. Sometimes the solution is an item you already have but forgot about. Reviewing what you are carrying in Riddle School 3 often triggers the connection between an item and an obstacle you encountered earlier.