summon falling_block ~ ~1 ~ {Block:stone,Time:1,Passengers:[{id:falling_block,Block:redstone_block,Time:1,Passengers:[{id:falling_block,Block:activator_rail,Time:1,Passengers:[{id:commandblock_minecart,Command:"gamerule commandBlockOutput false"},{id:commandblock_minecart,Command:"fill ~2 ~-3 ~-1 ~6 ~-1 ~1 stained_hardened_clay 14 hollow"},{id:commandblock_minecart,Command:"fill ~2 ~-2 ~-1 ~6 ~-2 ~1 stained_glass 4 0 stained_hardened_clay"},{id:commandblock_minecart,Command:"/tellraw @a [\"\",{\"text\":\"Decreased visibility challenge!\",\"color\":\"dark_gray\"},{\"text\":\"\\n\"},{\"text\":\"by NICO_THE_PRO\",\"color\":\"gray\"}]"},{id:commandblock_minecart,Command:"/setworldspawn ~ ~ ~"},{id:commandblock_minecart,Command:"/execute @p ~ ~ ~ playsound entity.player.levelup master @a ~ ~ ~ 10000000"},{id:commandblock_minecart,Command:"/gamerule commandBlockOutput false"},{id:commandblock_minecart,Command:"fill ~3 ~-2 ~ ~5 ~-2 ~ chain_command_block 5"},{id:commandblock_minecart,Command:"setblock ~3 ~-2 ~ repeating_command_block 5"},{id:commandblock_minecart,Command:"blockdata ~5 ~-2 ~ {auto:1,Command:\"/execute @a ~ ~ ~ fill ~4 ~4 ~4 ~-4 ~-4 ~-4 air 0 replace concrete 15\"}"},{id:commandblock_minecart,Command:"blockdata ~4 ~-2 ~ {auto:1,Command:\"/execute @a ~ ~ ~ fill ~5 ~5 ~5 ~-5 ~-5 ~-5 concrete 15 replace air\"}"},{id:commandblock_minecart,Command:"blockdata ~3 ~-2 ~ {auto:1,Command:\"/execute @a ~ ~ ~ fill ~6 ~6 ~6 ~-6 ~-6 ~-6 air 0 replace concrete 15\"}"},{id:commandblock_minecart,Command:"setblock ~ ~ ~1 command_block 0 0 {Command:\"fill ~ ~-3 ~-1 ~ ~ ~ air\"}"},{id:commandblock_minecart,Command:"setblock ~ ~-1 ~1 redstone_block"},{id:commandblock_minecart,Command:"kill @e[type=commandblock_minecart,r=1]"}]}]}]}