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* ''VideoGame/{{KOJOUJI}}'': There are locked doors in the game you will need to collect certain key cards to be able to open. You start the game with the missing person's key card.
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* ''VideoGame/SherlockHolmesTheMysteryOfTheMummy'': SherlockHolmes can find a key in the mansion to a locked door. However, he refuses to use it right away on the grounds that the lock is so rusted it's liable to break the key. So you'll need to find an oil can to use on the door first.

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* ''VideoGame/SherlockHolmesTheMysteryOfTheMummy'': SherlockHolmes Franchise/SherlockHolmes can find a key in the mansion to a locked door. However, he refuses to use it right away on the grounds that the lock is so rusted it's liable to break the key. So you'll need to find an oil can to use on the door first.
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* ''VideoGame/SherlockHolmesTheMysteryOfTheMummy'': SherlockHolmes can find a key in the mansion to a locked door. However, he refuses to use it right away on the grounds that the lock is so rusted it's liable to break the key. So you'll need to find an oil can to use on the door first.
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* ''VideoGame/{{Harthorn}}'': The school has changed and updated their locks in favour of key pads and key cards following an unspecified incident. Despite this, you can still find keys that open locked doors.
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* ''VideoGame/{{Alisa}}'': There are plenty of locked doors in the dollhouse that [[PlayerCharacter Alisa]] needs to find the right key for. The keys she finds, she keeps on her key ring.
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\n* ''VideoGame/TheNightWayHome'': One of the first puzzles in the game is to find the key to the security room.
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The LockAndKeyPuzzle is one of the oldest and most common puzzle types across adventure games, especially InteractiveFiction. Its advantages include a tighter coupling with the model world than the SetPiecePuzzle. The setup is also easy to couple with plot developments, using the "key" as a PlotCoupon. The major disadvantages of this puzzle type are, on one hand, the possibility of CombinatorialExplosion and, on the other hand, the possibility of ThisLooksLikeAJobForAquaman.

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The LockAndKeyPuzzle Lock and Key Puzzle is one of the oldest and most common puzzle types across adventure games, especially InteractiveFiction. Its advantages include a tighter coupling with the model world than the SetPiecePuzzle. The setup is also easy to couple with plot developments, using the "key" as a PlotCoupon. The major disadvantages of this puzzle type are, on one hand, the possibility of CombinatorialExplosion and, on the other hand, the possibility of ThisLooksLikeAJobForAquaman.
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* ''VideoGame/EccoTheDolphin'': The majority of the series' puzzles are in this format. "SEARCH FOR THE KEY-GLYPH" indeed.
* ''VideoGame/{{Kolibri}}'': This shooter has both autoscrolling levels and puzzle levels. The vast majority of the puzzle levels are in this format, requiring Kolibri to find a single-use powerup to blast through stones in his way.

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* ''VideoGame/LivestreamEscapeFromHotelIzanami'': Plenty of rooms in the hotel are locked, and require a key to open.
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* ''VideoGame/{{Eldervale}}'': This game has its share of locked doors you need to find keys for, alongside ones you need to unbolt from the other side.
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* ''VideoGame/RootsOfInsanity'': One of the first puzzles faced in the game is locating the key to B block.
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* ''VideoGame/TheCaregiver'': The shed at Souichi's house is locked shut, and the key's in a box with a rusted lock.
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* ''VideoGame/Trenches2021'': There's at least one locked door in the game you need to find the key for.
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* ''VideoGame/LunchLady'': Plenty of doors in the school are locked, and you need to find the keys to open them.
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* ''VideoGame/NinjaOutbreak'': There are differently-coloured doors in the game that need their corresponding keys to unlock.
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* ''VideoGame/{{Hanako}}'': The school the game is set in is [=FULL=] of locked doors. Each one needs the corresponding key to open it up.
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* ''VideoGame/TodayIsMyBirthday'' has locked doors, and you will need to find keys for them.
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* ''VideoGame/CastleInTheDarkness'' has a number of doors you need to find a key for.
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* One of the quests in ''VideoGame/{{Withstand}}'' involves exploring a key card that you need to open a door.

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* One of the quests in ''VideoGame/{{Withstand}}'' involves exploring locating a key card that you need to open a door.
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* ''VideoGame/Clea2019'' has its share of locked doors. In at least one instance, the key is broken into several pieces that you will need to find and reassemble.

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* ''VideoGame/Clea2019'' has its share of locked doors. In at least one instance, ''VideoGame/Clea2019'': The doors to clear the key is broken levels are all locked, and you need to find the keys. Said keys are all separated into several pieces that three pieces, so you will need to find and reassemble.combine them so they can work.
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* ''VideoGame/Clea2019'' has its share of locked doors. In at least one instance, the key is broken into several pieces that you will need to find and reassemble.
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* ''VideoGame/ATechCybernetic'' has its share. The thing is, you just need to have the key in your inventory, and you can unlock the corresponding door by placing your hand on the scanner.
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* ''VideoGame/StringTyrant'': The player progresses the manor, by finding keys to open doors. These are helpfully labeled with card suites both on the key and relevant door.
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* ''VideoGame/{{HEPH}}'' begins with the PlayerCharacter in a locked room that requires a key card to get out. The only way to get it is to [[ItemCrafting make one]] from the resources acquired by breaking down objects in the room.
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* ''VideoGame/BlameHim'' has its share of locked doors that require keys to open. Luckily for the first one, the key's in the same room.

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