Minecraft UHC 1.9+ (Signs might not work in 1.10 or higher) I purposely made it small and simple :) Features: Creeper explodes instantly when near player; creepers have more powerful explosions; ghasts have more explosive fireballs; no natural regeneration (gain hearts when full hunger); spiders and cave spiders make slowing cobwebs; zombies starve you like husks; you lose hunger way more quickly; nethermobs burn nearby mobs; slimes and magmars are giant and unstoppable; blazes shoot napalm fireballs
How to install
How to import this command into your world
First, you must give yourself a command block (If you are on a server, you must be 'OP'ed, and have access to /gamemode 1)
To get a command block, type
/give @p command_block in the chat.
Once you have a command block, right click it to open it's GUI.
Now, you must copy and paste the command from your browser into the game. Select the entire command from below, then right click and press 'copy'.
Next, go back to your minecraft world, and paste the command you just copied into the command block. There are a few different keys that may be used to do this, depending on your keyboard. The most common ones are 'CTRL + V', 'COMMAND + V', or 'STRG + V'
Finally, you can press done to exit the GUI, and execute the command block by powering it with a redstone block, a lever, or any thing you can get your grubby hands on. Just make sure you don't place it on top of the command block, or the machine will not be installed!
Show source commands
/execute @a ~ ~ ~ /entitydata @e[type=Creeper,r=3] {Fuse:0}
/entitydata @e[type=Creeper] {ExplosionRadius:5}
/entitydata @e[type=Fireball] {ExplosionPower:10}
INIT:/gamerule naturalRegeneration false
/execute @e[type=Spider] ~ ~ ~ /summon FallingSand ~ ~ ~ {Block:web,Data:0,Time:0,DropItem:0}
/execute @e[type=Spider] ~ ~ ~ /effect @e[r=2] 2 3 9
/execute @e[type=CaveSpider] ~ ~ ~ /summon FallingSand ~ ~ ~ {Block:web,Data:0,Time:0,DropItem:0}
/execute @e[type=CaveSpider] ~ ~ ~ /effect @e[r=2] 2 3 9
/execute @e[type=Zombie] ~ ~ ~ /effect @a 17 10 3
/effect @a 17 2 0
/execute @e[type=PigZombie] ~ ~ ~ /entitydata @a[r=4] {Fire:1100}
/execute @e[type=LavaSlime] ~ ~ ~ /entitydata @a[r=4] {Fire:1100}
/execute @e[type=Blaze] ~ ~ ~ /entitydata @a[r=4] {Fire:1100}
/execute @e[type=Zombie] ~ ~ ~ /fill ~3 ~3 ~3 ~-3 ~-3 ~-3 air 0 replace wooden_door
/execute @e[type=Zombie] ~ ~ ~ /fill ~3 ~3 ~3 ~-3 ~-3 ~-3 air 0 replace spruce_door
/execute @e[type=Zombie] ~ ~ ~ /fill ~3 ~3 ~3 ~-3 ~-3 ~-3 air 0 replace birch_door
/execute @e[type=Zombie] ~ ~ ~ /fill ~3 ~3 ~3 ~-3 ~-3 ~-3 air 0 replace jungle_door
/execute @e[type=Zombie] ~ ~ ~ /fill ~3 ~3 ~3 ~-3 ~-3 ~-3 air 0 replace acacia_door
/execute @e[type=Zombie] ~ ~ ~ /fill ~3 ~3 ~3 ~-3 ~-3 ~-3 air 0 replace dark_oak_door_door
/execute @e[type=Zombie] ~ ~ ~ /fill ~2 ~2 ~2 ~-2 ~-2 ~-2 air 0 replace iron_door
/entitydata @e[type=Slime,score_slime1=20] {Size:8}
/entitydata @e[type=LavaSlime,score_slime1=20] {Size:8}
/scoreboard objectives add slime1 dummy slime1
/scoreboard players add @e[type=Slime] slime1 1
/scoreboard players add @e[type=LavaSlime] slime1 1
/execute @e[type=SmallFireball] ~ ~ ~ /summon Fireball ~ ~ ~ {Motion:[0.0,0.0,0.0],direction:[0.0,0.0,0.0],ExplosionPower:8}
summon FallingSand ~ ~1 ~ {Block:stone,Time:1,Passengers:[{id:FallingSand,Block:redstone_block,Time:1,Passengers:[{id:FallingSand,Block:activator_rail,Time:1,Passengers:[{id:MinecartCommandBlock,Command:gamerule commandBlockOutput false},{id:MinecartCommandBlock,Command:"fill ~2 ~-3 ~-2 ~8 ~ ~2 stained_hardened_clay 1 hollow"},{id:MinecartCommandBlock,Command:"fill ~2 ~-2 ~-2 ~8 ~-1 ~2 stained_glass 14 replace stained_hardened_clay"},{id:MinecartCommandBlock,Command:"/gamerule naturalRegeneration false"},{id:MinecartCommandBlock,Command:setblock ~1 ~-2 ~ wall_sign 4 replace {Text2:"{\\\"text\\\":\\\"By\\\",\\\"color\\\":\\\"black\\\"}",Text3:"{\\\"text\\\":\\\"ST0RMPEGASIS\\\",\\\"color\\\":\\\"black\\\"}"}},{id:MinecartCommandBlock,Command:setblock ~1 ~-1 ~ wall_sign 4 replace {Text2:"{\\\"text\\\":\\\"[Destroy Machine]\\\",\\\"color\\\":\\\"black\\\"}",Text4:"{\\\"text\\\":\\\"\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"fill ~ ~-2 ~-2 ~7 ~1 ~2 air\\\"}}"}},{id:MinecartCommandBlock,Command:setblock ~7 ~-1 ~ chain_command_block 2 replace {auto:1,Command:"/execute @e[type=SmallFireball] ~ ~ ~ /summon Fireball ~ ~ ~ {Motion:[0.0,0.0,0.0],direction:[0.0,0.0,0.0],ExplosionPower:8}"}},{id:MinecartCommandBlock,Command:setblock ~6 ~-1 ~ chain_command_block 5 replace {auto:1,Command:"/scoreboard players add @e[type=LavaSlime] slime1 1"}},{id:MinecartCommandBlock,Command:setblock ~5 ~-1 ~ chain_command_block 5 replace {auto:1,Command:"/scoreboard players add @e[type=Slime] slime1 1"}},{id:MinecartCommandBlock,Command:setblock ~4 ~-1 ~ chain_command_block 5 replace {auto:1,Command:"/scoreboard objectives add slime1 dummy slime1"}},{id:MinecartCommandBlock,Command:setblock ~3 ~-1 ~ chain_command_block 5 replace {auto:1,Command:"/entitydata @e[type=LavaSlime,score_slime1=20] {Size:8}"}},{id:MinecartCommandBlock,Command:setblock ~3 ~-1 ~1 chain_command_block 2 replace {auto:1,Command:"/entitydata @e[type=Slime,score_slime1=20] {Size:8}"}},{id:MinecartCommandBlock,Command:setblock ~4 ~-1 ~1 chain_command_block 4 replace {auto:1,Command:"/execute @e[type=Zombie] ~ ~ ~ /fill ~2 ~2 ~2 ~-2 ~-2 ~-2 air 0 replace iron_door"}},{id:MinecartCommandBlock,Command:setblock ~5 ~-1 ~1 chain_command_block 4 replace {auto:1,Command:"/execute @e[type=Zombie] ~ ~ ~ /fill ~3 ~3 ~3 ~-3 ~-3 ~-3 air 0 replace dark_oak_door_door"}},{id:MinecartCommandBlock,Command:setblock ~6 ~-1 ~1 chain_command_block 4 replace {auto:1,Command:"/execute @e[type=Zombie] ~ ~ ~ /fill ~3 ~3 ~3 ~-3 ~-3 ~-3 air 0 replace acacia_door"}},{id:MinecartCommandBlock,Command:setblock ~7 ~-1 ~1 chain_command_block 4 replace {auto:1,Command:"/execute @e[type=Zombie] ~ ~ ~ /fill ~3 ~3 ~3 ~-3 ~-3 ~-3 air 0 replace jungle_door"}},{id:MinecartCommandBlock,Command:setblock ~7 ~-2 ~1 chain_command_block 1 replace {auto:1,Command:"/execute @e[type=Zombie] ~ ~ ~ /fill ~3 ~3 ~3 ~-3 ~-3 ~-3 air 0 replace birch_door"}},{id:MinecartCommandBlock,Command:setblock ~6 ~-2 ~1 chain_command_block 5 replace {auto:1,Command:"/execute @e[type=Zombie] ~ ~ ~ /fill ~3 ~3 ~3 ~-3 ~-3 ~-3 air 0 replace spruce_door"}},{id:MinecartCommandBlock,Command:setblock ~5 ~-2 ~1 chain_command_block 5 replace {auto:1,Command:"/execute @e[type=Zombie] ~ ~ ~ /fill ~3 ~3 ~3 ~-3 ~-3 ~-3 air 0 replace wooden_door"}},{id:MinecartCommandBlock,Command:setblock ~4 ~-2 ~1 chain_command_block 5 replace {auto:1,Command:"/execute @e[type=Blaze] ~ ~ ~ /entitydata @a[r=4] {Fire:1100}"}},{id:MinecartCommandBlock,Command:setblock ~3 ~-2 ~1 chain_command_block 5 replace {auto:1,Command:"/execute @e[type=LavaSlime] ~ ~ ~ /entitydata @a[r=4] {Fire:1100}"}},{id:MinecartCommandBlock,Command:setblock ~3 ~-2 ~ chain_command_block 3 replace {auto:1,Command:"/execute @e[type=PigZombie] ~ ~ ~ /entitydata @a[r=4] {Fire:1100}"}},{id:MinecartCommandBlock,Command:setblock ~4 ~-2 ~ chain_command_block 4 replace {auto:1,Command:"/effect @a 17 2 0"}},{id:MinecartCommandBlock,Command:setblock ~5 ~-2 ~ chain_command_block 4 replace {auto:1,Command:"/execute @e[type=Zombie] ~ ~ ~ /effect @a 17 10 3"}},{id:MinecartCommandBlock,Command:setblock ~6 ~-2 ~ chain_command_block 4 replace {auto:1,Command:"/execute @e[type=CaveSpider] ~ ~ ~ /effect @e[r=2] 2 3 9"}},{id:MinecartCommandBlock,Command:setblock ~7 ~-2 ~ chain_command_block 4 replace {auto:1,Command:"/execute @e[type=CaveSpider] ~ ~ ~ /summon FallingSand ~ ~ ~ {Block:web,Data:0,Time:0,DropItem:0}"}},{id:MinecartCommandBlock,Command:setblock ~7 ~-2 ~-1 chain_command_block 3 replace {auto:1,Command:"/execute @e[type=Spider] ~ ~ ~ /effect @e[r=2] 2 3 9"}},{id:MinecartCommandBlock,Command:setblock ~6 ~-2 ~-1 chain_command_block 5 replace {auto:1,Command:"/execute @e[type=Spider] ~ ~ ~ /summon FallingSand ~ ~ ~ {Block:web,Data:0,Time:0,DropItem:0}"}},{id:MinecartCommandBlock,Command:setblock ~5 ~-2 ~-1 chain_command_block 5 replace {auto:1,Command:"/entitydata @e[type=Fireball] {ExplosionPower:10}"}},{id:MinecartCommandBlock,Command:setblock ~4 ~-2 ~-1 chain_command_block 5 replace {auto:1,Command:"/entitydata @e[type=Creeper] {ExplosionRadius:5}"}},{id:MinecartCommandBlock,Command:setblock ~3 ~-2 ~-1 repeating_command_block 5 replace {auto:1,Command:"/execute @a ~ ~ ~ /entitydata @e[type=Creeper,r=3] {Fuse:0}"}},{id:MinecartCommandBlock,Command:setblock ~ ~ ~1 command_block 0 replace {Command:fill ~ ~-3 ~-1 ~ ~ ~ air}},{id:MinecartCommandBlock,Command:setblock ~ ~-1 ~1 redstone_block},{id:MinecartCommandBlock,Command:kill @e[type=MinecartCommandBlock,r=1]}]}]}]}
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