Puzzles are a rare thing in Onimusha: Way of the Sword, Capcom's samurai action reboot, but the "What Lurks in the Shadows" quest in the Underground Laboratory throws one at you. A mask sits locked inside a cage, guarded by four hanging masks above it, and you'll need to interact with them in the correct order to open the cage. Shizuka will chime in with hints as you struggle, but they won't actually point you towards the solution. The trick isn't in the room with the cage at all; it's on the wall behind you.
Where to find the mask puzzle
The puzzle sits inside the Underground Laboratory, in the shrine-like room where you find the caged mask beneath a large mural. Four masks hang from the ceiling directly above the cage. Interacting with them in the wrong order won't damage anything, so there's no risk in experimenting, but you'll want the answer sorted before you start firing.
How to solve the mask puzzle
Turn away from the cage and look at the opposite wall. You'll spot the same four masks depicted in a set of round windows there, each lit from behind. Step outside that room entirely and look down at the floor. The light source behind each depicted mask casts a shadow, and each shadow has a different number of holes in it, one, two, three, and four.
Match those hole counts back to the hanging masks above the cage. Counting the hanging masks left to right, the mask in the third position casts a shadow with only one hole, so that's the one to shoot first. The fourth mask casts a two-hole shadow, so it's second. The first mask casts a three-hole shadow, third. The second mask casts a four-hole shadow, so it goes last. In short, shoot the masks in the order three, four, one, two. Get that sequence right and the cage unlocks.
Quick tip: Check the shadows before you touch anything above the cage. Once you've counted the holes on all four, the order is fixed and won't change, so there's no need to double back and recheck mid-puzzle.
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