✎ tutorials:mapping:trick_combo_lock [ ]

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=====Combination Lock=====
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You can make a 4-button combination lock using a demon (or other monster) like so:
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{{:tutorials:mapping:monster_lock_illustration.png?600|}}
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It works like this. The Demon starts out in the first room (woken by the players gunfire ofc), with 4 teleporters behind "S1-Door-Open-Stay-Fast" doors. The switches are available to the player in the main part of the map, and eah corresponds to a door blocking the demon from the teleporters. The red teleporters in this illustration represent incorrect switch throws - the door opens up and the Demon teleports elsewhere aborting the combination. The green teleporter represents a correct throw - the Demon teleports to the next location in the sequence.
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The next location has 3 doors for the 3 remaining switches in your combination. The correct throw teleports the Demon to the next location in the sequence - 2 doors for the last 2 switches. Then to the final location for the final switch.
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The final switch opens the final door. The demon runs across a linedef (the dotted line) that triggers a "W1-Door-Open-Wait-Close" door. This door is timed and will never open again - BUT - you can add another teleport to the final room that teleports the demon to a hidden area where he james the door open. This part is hard to explain, but the example wad here should show it well enough:
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{{ :tutorials:mapping:ccccombo.zip |}}\\ 
(use doom2.wad)
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You could theoretically add more buttons, but I think it would get more cumbersom and less likely to run smoothly. As is you would have a hard time breaking the sequence, even with the switches directly next to eachother, and would probably have to rely on tool-assist to do it. The longer distance the demon has to travel to make it to the teleporters, the easier you could break the sequence.
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If you want to be able to 100% the kills in the map you'll need to add a crusher activated by the player at the end of the map that smooshes the demon. So he'll have to be straddling 3 sectors (this will make sense if you look at the included wad).
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Results:
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{{ :tutorials:mapping:1753249272626352.webm |}}
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That's it. I think you could use a similar set up for other things. Obviously elevator activation would be one... I dunno. Use your imagination.

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