Count the Locks! is the ninth level of Doorhaven. It uses the Bulk Key and Bulk Door mechanics introduced in the previous level, asking the player to count the locks to see which route can be opened with 16 white keys. This type of counting is useful for many later puzzles in the game.
Description
It's time to play everyone's favorite game, Count the Locks! It's as simple as it sounds! Although, if you don't want to play that game, you could enable the Simple Locks option to turn everything into numbers. That's fine, too!
Puzzle Logic
The only logic needed for this puzzle is to move forward while spending as few white keys as possible.
The first set (from top to bottom) has 11, 9, and 10 locks. The middle path has the lowest total and is therefore the best choice.
The second set has 8 locks on top and 7 locks on bottom. The bottom path is the winning choice here.
Solution
Pick up the 16 white keys.
Open all doors in the middle-left row.
Open all doors in the bottom-right row.
Touch the goal.