How to solve the Grandfather’s musical contraption puzzle in Ad Infinitum? Full walkthrough

Screenshot of a wide view of mother's music room in Ad Infinitum.

Are you stuck trying to solve the Grandfather’s musical contraption puzzle in Ad Infinitum? Nothing to worry about, we’ll explain exactly how to fix it.

The psychological horror game, Ad Infinitum, places the player in the shoes of a WWI German soldier struggling with nightmares and loss. While there is more to unravel beneath the surface, players will have to face horrific creatures and solve puzzles to progress the story. Every little bit reveals more about the narrative and its horrific implications. However, that means that you’ll have to solve those puzzle challenges first. One such puzzle you’ll encounter early on in Ad Infinitum requires you to fix your Grandfather’s musical contraption. This guide will explain how to do it. 

All steps to fix Grandfather’s musical contraption in Ad Infinitum

After finishing the Prologue and waking up in your old room in the family manor back in Germany, you will undoubtedly have many questions. Strange visions swamp your sight, and some exploration around the room gives you hints about the home life of our protagonist. However, you have to leave the comfort of the room and explore the house, which looks unkempt and haunted by strange visions and sounds. In fact, you may just catch a vision of someone entering your brother’s room, the one adjacent to yours. That door is locked and something you will revisit later on in the game. For now, turn left and keep going while examining every clickable that you can find to discover more of the story.

Puzzle pieces that you’re going to need

The first large foyer that you discover reveals that you’re on the first floor of the house. There is a freshly installed elevator that’s out of function, as well as stairs leading down. Here you will also find a large Cog. Pick it up, you’re going to need it for the puzzle. The other doors are currently inaccessible, so make your way down the stairs. Don’t mind the scary ghost on the way down.

The locked room into which the ghost lady disappears is the one we want to access, and the objective of the first puzzle. How do we know that? Take a left turn from the bottom of the stairs and enter your mother’s sewing room. One of the letters explains how much she hated the military marches your grandfather used to play. While exploring this room, you can trigger the songbird and the music recorder to hear more ghostly reactions from around the house.

Mother's sewing room in Ad Infinitum, as part of Grandfather's musical contraption puzzle.
Image by N4G Unlocked

Here, you will also find the Music cylinder. Pick it up, as it’s another piece that you’ll need for the puzzle. Keep exploring the corridors until you find yourself in the manor’s main hall. Aside from the mortuary decor that tells you more about the state of the family, you’ll see a wide double staircase that leads upstairs. It doesn’t matter which way you choose to go, because it all loops around. 

The main hall in Ad Infinitum, as part of Grandfather's musical contraption puzzle.
Image by N4G Unlocked

Climb up and go to the table positioned at the centre. There is a box on the table which you can open to find a Key. Pick it up, this is the last piece of the puzzle. Now you’re ready to get to the contraption and fix it.

The location of the first Key in Ad Infinitum, as part of Grandfather's musical contraption puzzle.
Image by N4G Unlocked

Fixing the Grandfather’s musical contraption

With everything tucked in your inventory, head back down into the hall and retrace your steps back to the locked mother’s music room which we mean to access. Continuing forward from the door, turn right and you’ll see a nook dominated by the large contraption. It’s clearly out of order and the drawers and doors are all locked.

First, use the Key to open everything up. This reveals the inner mechanisms of the contraption. Place the Music cylinder in its place, then follow that up by replacing the Cog at the bottom. With everything ready, press the Start button.

Steps to fix Grandfather's musical contraption puzzle in Ad Infinitum.
Image by N4G Unlocked

Your grandfather’s marching music will start playing, triggering a spectral wail from your mother’s music room. Turn around and head back to the door that is now unlocked and the room accessible. Within, you will find a creepy setup for a seance, complete with a haggard-looking figure sitting at the table.

With that puzzle out of the way, you’re set to explore the rest of Ad Infinitum’s story. For other articles about the horror title, check out How to Save in Ad Infinitum, Is Ad Infinitum Crossplay and Cross-platform, and Is Ad Infinitum Multiplayer & Can You Play in Co-op.

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