[Note: It’s been a while since I have done this work on a map and these tools that I mention below may be out of date. Nonetheless this may be a good place to start if you care to try something like this yourself.]
I find that Minecraft mishaps are some of the funniest things I can ever experience, here is one such mishap:
On the various servers that I have set up for my son and his friends, I have built or edited some area of the map in order to set up some sort of adventure. I set up perhaps a castle with a mob generator in it and some treasure chests placed in a more inaccessible part. The tricky bit is to make it somewhat obvious to the players what their goal or goals are. My solution was usually to make a number of interesting things in the area and hope for the best.
A tool I use to edit maps is MCedit ( http://www.mcedit.net ) which works on OSX and Windows. It allows me to more or less cut and paste things into (and out of) Minecraft map files. Add on scripts which can be found with an internet search can add functions like road or castle generation.
In this particular case I chose to make a dungeon using a plugin or add on script that works with MCedit called “Dungeon schematic randomizer” ( http://www.brightmoore.net/mcedit-filters-1/dungeonschematicrandomizerv2 ). This lets one make a dungeon made up of a number of set rooms that will be randomly arranged in such a way to all be connected. The result is not always satisfactory in that it often produces difficult to navigate dungeons which may frustrate players.
I chose a room somewhat deep in the generated dungeon and made, what I thought, would be, an interesting treasure room with a puzzle that employed some redstone circuitry that would allow a hidden chest to be revealed. This was a finishing touch and although there are some puzzle rooms included in the set rooms from the the above plugin I chose to make my puzzle room myself in creative mode. Thus I went about mining out the room a bit and placing my fairly simple red stone device which was a well with a pressure plate at the bottom that was connected with redstone to a piston which would pull back to reveal the hidden chest in the floor when someone threw an item of some sort down the well. There was also a somewhat cryptic clue on a sign to encourage the kids to throw something down. In the course of building this in creative mode I decided that I wanted to discourage mining through walls to get at the treasure instead of figuring out the puzzle. So I included monster egg blocks in the blocks I set in the walls and the well. Monster egg stone blocks look like stone blocks except that they take slightly longer to mine and then release a silverfish . Silverfish will also spontaneously emerge from monster egg blocks if there is a silverfish being attacked nearby. This will be important later in the story.
So I was finally satisfied with my creation and invited my son and a friend to investigate the dungeon. They were somewhat reluctant and to encourage them I followed along in creative mode to offer advice and recover dropped items should something bad happen. Eventually, with some prompting, we arrived at the entrance to the treasure room. At this point we were jumped by some zombies and a creeper which normally wouldn’t be much trouble. However, the creeper blew up, damaging some nearby blocks and an unfortunate series of events followed.
When I was applying what I thought was a sprinkling of monster egg blocks to my creation I seem to have lost track of when I was using a regular block and when I was using the former. They look exactly the same in the slots on-screen and I used many more than I thought I had.
Fast forward to our encounter at the treasure room and the result was a cascade of silverfish emerging from blocks everywhere. I helped but every time it seemed we had them licked, a new wave came at us. When silverfish emerge from their block on their own, the block is destroyed and the treasure room began to look like Swiss cheese. They also will burrow into a block if they are not otherwise occupied and thus even more blocks were destroyed when they emerged again. The result was a hilarious, panicked session which we somehow all survived, escaping with the loot from the now exposed “secret” chest. Pictured below is what is left of the treasure room.
That was my memorable experience with map making. If you choose to try it and it is still possible even with the current version (this particular adventure occurred on a Minecraft Realm), I wish you good luck and always know where your backup file is.