How to intall this one command creation in your 1.11 world
1 Be sure to be in creative mode
2 Press T to open the chat
3 Write "/give @p command_block" to get a command block
4 face east (f3 to know the direction you're looking at)
5 place the command
6 right-click it and paste the command
7 press the "always active" button, and then press "done"
8 enjoy =D

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 ~-2 ~10 ~1 ~2 obsidian 0 hollow"},{id:commandblock_minecart,Command:"fill ~2 ~-2 ~-2 ~10 ~ ~2 stained_glass 1 replace obsidian"},{id:commandblock_minecart,Command:"/tellraw @a [\"\",{\"text\":\"----------------------------------------------------\",\"color\":\"gold\"}]"},{id:commandblock_minecart,Command:scoreboard objectives add psng dummy},{id:commandblock_minecart,Command:scoreboard objectives add psnc dummy},
{id:commandblock_minecart,Command:scoreboard objectives add psnp dummy},
{id:commandblock_minecart,Command:scoreboard objectives add psns dummy},{id:commandblock_minecart,Command:setblock ~3 ~-2 ~-2 gold_block},{id:commandblock_minecart,Command:setblock ~6 ~-2 ~-2 planks},{id:commandblock_minecart,Command:setblock ~9 ~-1 ~-2 redstone_block},{id:commandblock_minecart,Command:setblock ~1 ~ ~ wall_sign 4 replace {Text1:"{\\\"text\\\":\\\"destroy\\\",\\\"color\\\":\\\"red\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"/setblock ~2 ~ ~-1 redstone_block 0\\\"}}",Text2:"{\\\"text\\\":\\\"\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"/playsound entity.generic.explode voice @a ~ ~ ~ 12 2 1\\\"}}",Text3:"{\\\"text\\\":\\\"\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"\\\"}}",Text4:"{\\\"text\\\":\\\"\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"\\\"}}"}},{id:commandblock_minecart,Command:setblock ~1 ~-3 ~-1 wall_sign 4 replace {Text1:"{\\\"text\\\":\\\"deactivate\\\",\\\"color\\\":\\\"dark_red\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"/blockdata ~2 ~1 ~ {auto:0b}\\\"}}",Text2:"{\\\"text\\\":\\\"\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"/playsound minecraft:block.chest.close voice @a ~ ~ ~ 10 1 1\\\"}}",Text3:"{\\\"text\\\":\\\"\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"/fill ~1 ~1 ~-1 ~9 ~3 ~4 stained_glass 14 replace stained_glass\\\"}}",Text4:"{\\\"text\\\":\\\"\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"\\\"}}"}},{id:commandblock_minecart,Command:setblock ~1 ~-3 ~1 wall_sign 4 replace {Text1:"{\\\"text\\\":\\\"activate\\\",\\\"color\\\":\\\"green\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"/blockdata ~2 ~1 ~-2 {auto:1b}\\\"}}",Text2:"{\\\"text\\\":\\\"\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"/playsound minecraft:block.chest.open voice @a ~ ~ ~ 10 1 1\\\"}}",Text3:"{\\\"text\\\":\\\"\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"/fill ~1 ~1 ~-3 ~9 ~3 ~4 stained_glass 1 replace stained_glass\\\"}}",Text4:"{\\\"text\\\":\\\"\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"\\\"}}"}},{id:commandblock_minecart,Command:setblock ~1 ~-2 ~ wall_sign 4 replace {Text1:"{\\\"text\\\":\\\"Items\\\",\\\"color\\\":\\\"dark_blue\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"/give @a minecraft:orange_shulker_box 1 0 {display:{Name:\\\\\\\"Snake Parkour Set\\\\\\\",Lore:[\\\\\\\"by GYGY\\\\\\\"]},BlockEntityTag:{Items:[{Slot:10b,id:\\\\\\\"minecraft:spawn_egg\\\\\\\",Count:1b,Damage:0s,tag:{EntityTag:{id:\\\\\\\"minecraft:endermite\\\\\\\",CustomName:\\\\\\\"psns\\\\\\\"},display:{Name:\\\\\\\"Spawn Snake\\\\\\\",Lore:[\\\\\\\"from Snake Parkour tool\\\\\\\",\\\\\\\"by GYGY\\\\\\\"]}}},{Slot:12b,id:\\\\\\\"minecraft:spawn_egg\\\\\\\",Count:1b,Damage:0s,tag:{EntityTag:{id:\\\\\\\"minecraft:endermite\\\\\\\",CustomName:\\\\\\\"psno\\\\\\\"},display:{Name:\\\\\\\"Snake Tail\\\\\\\",Lore:[\\\\\\\"from Snake Parkour tool\\\\\\\",\\\\\\\"by GYGY\\\\\\\"]}}},{Slot:14b,id:\\\\\\\"minecraft:spawn_egg\\\\\\\",Count:1b,Damage:0s,tag:{EntityTag:{id:\\\\\\\"minecraft:endermite\\\\\\\",CustomName:\\\\\\\"psnp\\\\\\\"},display:{Name:\\\\\\\"Edit Phase Cycler\\\\\\\",Lore:[\\\\\\\"from Snake Parkour tool\\\\\\\",\\\\\\\"by GYGY\\\\\\\"]}}},{Slot:16b,id:\\\\\\\"minecraft:spawn_egg\\\\\\\",Count:1b,Damage:0s,Count:64b,tag:{EntityTag:{id:\\\\\\\"minecraft:endermite\\\\\\\",CustomName:\\\\\\\"psng\\\\\\\"},display:{Name:\\\\\\\"Snake Starter\\\\\\\",Lore:[\\\\\\\"from Snake Parkour tool\\\\\\\",\\\\\\\"by GYGY\\\\\\\"]}}}]}}\\\"}}",Text2:"{\\\"text\\\":\\\"\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"/playsound minecraft:entity.experience_orb.pickup voice @a ~ ~ ~ 10 1 1\\\"}}",Text3:"{\\\"text\\\":\\\"\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"\\\"}}",Text4:"{\\\"text\\\":\\\"\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"\\\"}}"}},{id:commandblock_minecart,Command:"/tellraw @a [\"\",{\"text\":\"Snake parkour tool v 1.0 by GYGY. Click on the explenation sign to get started.\",\"color\":\"aqua\"}]"},{id:commandblock_minecart,Command:"/tellraw @a [\"\",{\"text\":\"----------------------------------------------------\",\"color\":\"gold\"}]"},{id:commandblock_minecart,Command:"/tellraw @a [\"\",{\"text\":\"Don't spam this command as your own one, and if you are a youtuber credit me and leave a link to my channel.\",\"color\":\"aqua\"}]"},{id:commandblock_minecart,Command:"/tellraw @a [\"\",{\"text\":\"----------------------------------------------------\",\"color\":\"gold\"}]"},{id:commandblock_minecart,Command:"/tellraw @a [\"\",{\"text\":\"Remember also to take a look of my channel:\",\"color\":\"aqua\"},{\"text\":\" My channel\",\"color\":\"dark_aqua\",\"clickEvent\":{\"action\":\"open_url\",\"value\":\"https://www.youtube.com/channel/UC3_Gm-pfskCh2bnzcekR0ow\"}}]"},{id:commandblock_minecart,Command:"/tellraw @a [\"\",{\"text\":\"----------------------------------------------------\",\"color\":\"gold\"}]"},{id:commandblock_minecart,Command:setblock ~1 ~-1 ~ wall_sign 4 replace {Text1:"{\\\"text\\\":\\\"Explenation\\\",\\\"color\\\":\\\"dark_blue\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"/tellraw @a [\\\\\\\"\\\\\\\",{\\\\\\\"text\\\\\\\":\\\\\\\"Spawn Snake places a block that spawns a snake. Snake tail is the path for the snake. You can switch through edit and game mode by the Game Phase Cycler. To spawn the snake, you have to use the Snake Starter item. If you enjoy this creation, remember to take a look of my channel: \\\\\\\",\\\\\\\"color\\\\\\\":\\\\\\\"gold\\\\\\\"},{\\\\\\\"text\\\\\\\":\\\\\\\"My channel\\\\\\\",\\\\\\\"color\\\\\\\":\\\\\\\"dark_aqua\\\\\\\",\\\\\\\"clickEvent\\\\\\\":{\\\\\\\"action\\\\\\\":\\\\\\\"open_url\\\\\\\",\\\\\\\"value\\\\\\\":\\\\\\\"https://www.youtube.com/channel/UC3_Gm-pfskCh2bnzcekR0ow\\\\\\\"}}]\\\"}}",Text2:"{\\\"text\\\":\\\"\\\",\\\"color\\\":\\\"aqua\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"/execute @a ~ ~ ~ playsound minecraft:entity.experience_orb.pickup voice @a ~ ~ ~ 12 1 1\\\"}}",Text3:"{\\\"text\\\":\\\"\\\",\\\"color\\\":\\\"dark_blue\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"2\\\"}}",Text4:"{\\\"text\\\":\\\"\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"3\\\"}}"}},{id:commandblock_minecart,Command:setblock ~3 ~-2 ~-1 repeating_command_block 5 replace {auto:1b,Command:"/execute @e[type=endermite,name=psns] ~ ~ ~ summon armor_stand ~ ~-1.2 ~ {CustomName:\\\"psns\\\",Invisible:1b,NoGravity:1b,ArmorItems:[{},{},{},{id:\\\"minecraft:gold_block\\\",Count:1b}],DisabledSlots:1052688}"}},{id:commandblock_minecart,Command:setblock ~4 ~-2 ~-1 chain_command_block 5 replace {auto:1b,Command:"/execute @e[type=endermite,name=psns] ~ ~ ~ setblock ~ ~ ~ barrier 0"}},{id:commandblock_minecart,Command:setblock ~5 ~-2 ~-1 chain_command_block 5 replace {auto:1b,Command:"/kill @e[type=endermite,name=psns]"}},{id:commandblock_minecart,Command:setblock ~6 ~-2 ~-1 chain_command_block 5 replace {auto:1b,Command:"/execute @e[type=endermite,name=psno] ~ ~ ~ summon armor_stand ~ ~-1.2 ~ {CustomName:\\\"psno\\\",Invisible:1b,NoGravity:1b,ArmorItems:[{},{},{},{id:\\\"minecraft:planks\\\",Count:1b}],DisabledSlots:1052688}"}},{id:commandblock_minecart,Command:setblock ~7 ~-2 ~-1 chain_command_block 5 replace {auto:1b,Command:"/execute @e[type=endermite,name=psno] ~ ~ ~ setblock ~ ~ ~ barrier 0"}},{id:commandblock_minecart,Command:setblock ~8 ~-2 ~-1 chain_command_block 5 replace {auto:1b,Command:"/kill @e[type=endermite,name=psno]"}},{id:commandblock_minecart,Command:setblock ~9 ~-2 ~-1 chain_command_block 3 replace {auto:1b,Command:"Random nothing dude ;D"}},{id:commandblock_minecart,Command:setblock ~9 ~-2 ~ chain_command_block 4 replace {auto:1b,Command:"/execute @a[score_psng_min=1,score_psng=1] ~ ~ ~ execute @e[type=armor_stand,name=psns] ~ ~ ~ summon armor_stand ~ ~1 ~ {CustomName:\\\"psnm\\\",Invisible:1b,NoGravity:1b}"}},{id:commandblock_minecart,Command:setblock ~8 ~-2 ~ chain_command_block 4 replace {auto:1b,Command:"/execute @a[score_psng_min=1,score_psng=1] ~ ~ ~ execute @e[type=armor_stand,name=psno] ~ ~ ~ setblock ~ ~2 ~ structure_void 0"}},{id:commandblock_minecart,Command:setblock ~7 ~-2 ~ chain_command_block 4 replace {auto:1b,Command:"/scoreboard players set @a psng 0"}},{id:commandblock_minecart,Command:setblock ~6 ~-2 ~ chain_command_block 4 replace {auto:1b,Command:"/execute @e[type=armor_stand,name=psnm] ~ ~ ~ setblock ~ ~1 ~ bedrock 0"}},{id:commandblock_minecart,Command:setblock ~5 ~-2 ~ chain_command_block 4 replace {auto:1b,Command:"/scoreboard players add @e[type=armor_stand,name=psnm] psnc 1"}},{id:commandblock_minecart,Command:setblock ~4 ~-2 ~ chain_command_block 4 replace {auto:1b,Command:"/scoreboard players set @a psns 0"}},{id:commandblock_minecart,Command:setblock ~3 ~-2 ~ chain_command_block 3 replace {auto:1b,Command:"/scoreboard players set @a psns 1 {SelectedItem:{id:\\\"minecraft:spawn_egg\\\",tag:{display:{Name:\\\"Edit Phase Cycler\\\"}}}}"}},{id:commandblock_minecart,Command:setblock ~3 ~-2 ~1 chain_command_block 5 replace {auto:1b,Command:"/title @a[score_psns_min=1,score_psns=1,score_psnp_min=0,score_psnp=0] actionbar [\\\"\\\",{\\\"text\\\":\\\"Game Phase\\\",\\\"color\\\":\\\"green\\\",\\\"bold\\\":true}]"}},{id:commandblock_minecart,Command:setblock ~4 ~-2 ~1 chain_command_block 5 replace {auto:1b,Command:"/execute @e[type=armor_stand,name=psnm,score_psnc_min=5,score_psnc=5] ~ ~ ~ detect ~1 ~1 ~ structure_void 0 summon armor_stand ~1 ~ ~ {CustomName:\\\"psnm\\\",Invisible:1b,NoGravity:1b}"}},{id:commandblock_minecart,Command:setblock ~5 ~-2 ~1 chain_command_block 5 replace {auto:1b,Command:"/execute @e[type=armor_stand,name=psnm,score_psnc_min=5,score_psnc=5] ~ ~ ~ detect ~-1 ~1 ~ structure_void 0 summon armor_stand ~-1 ~ ~ {CustomName:\\\"psnm\\\",Invisible:1b,NoGravity:1b}"}},{id:commandblock_minecart,Command:setblock ~6 ~-2 ~1 chain_command_block 5 replace {auto:1b,Command:"/execute @e[type=armor_stand,name=psnm,score_psnc_min=5,score_psnc=5] ~ ~ ~ detect ~ ~1 ~1 structure_void 0 summon armor_stand ~ ~ ~1 {CustomName:\\\"psnm\\\",Invisible:1b,NoGravity:1b}"}},{id:commandblock_minecart,Command:setblock ~7 ~-2 ~1 chain_command_block 5 replace {auto:1b,Command:"/execute @e[type=armor_stand,name=psnm,score_psnc_min=5,score_psnc=5] ~ ~ ~ detect ~ ~1 ~-1 structure_void 0 summon armor_stand ~ ~ ~-1 {CustomName:\\\"psnm\\\",Invisible:1b,NoGravity:1b}"}},{id:commandblock_minecart,Command:setblock ~8 ~-2 ~1 chain_command_block 5 replace {auto:1b,Command:"/execute @e[type=armor_stand,name=psnm,score_psnc_min=5,score_psnc=5] ~ ~ ~ detect ~ ~2 ~ structure_void 0 summon armor_stand ~ ~1 ~ {CustomName:\\\"psnm\\\",Invisible:1b,NoGravity:1b}"}},{id:commandblock_minecart,Command:setblock ~9 ~-2 ~1 chain_command_block 1 replace {auto:1b,Command:"/execute @e[type=armor_stand,name=psnm,score_psnc_min=5,score_psnc=5] ~ ~ ~ detect ~ ~ ~ structure_void 0 summon armor_stand ~ ~-1 ~ {CustomName:\\\"psnm\\\",Invisible:1b,NoGravity:1b}"}},{id:commandblock_minecart,Command:setblock ~9 ~-1 ~1 chain_command_block 4 replace {auto:1b,Command:"/execute @e[type=endermite,name=psnre] ~ ~ ~ execute @e[type=armor_stand,name=psno,r=5] ~ ~ ~ setblock ~ ~2 ~ air"}},{id:commandblock_minecart,Command:setblock ~8 ~-1 ~1 chain_command_block 4 replace {auto:1b,Command:"/execute @e[type=endermite,name=psnp] ~ ~ ~ scoreboard players add @a psnp 1"}},{id:commandblock_minecart,Command:setblock ~7 ~-1 ~1 chain_command_block 4 replace {auto:1b,Command:"/scoreboard players set @a[score_psnp_min=2] psnp 0"}},{id:commandblock_minecart,Command:setblock ~6 ~-1 ~1 chain_command_block 4 replace {auto:1b,Command:"/kill @e[type=endermite,name=psnp]"}},{id:commandblock_minecart,Command:setblock ~5 ~-1 ~1 chain_command_block 4 replace {auto:1b,Command:"/execute @e[type=endermite,name=psng] ~ ~ ~ scoreboard players set @a psnp 0"}},{id:commandblock_minecart,Command:setblock ~4 ~-1 ~1 chain_command_block 4 replace {auto:1b,Command:"/execute @a[score_psnp_min=0,score_psnp=0] ~ ~ ~ execute @e[type=armor_stand,name=psno] ~ ~ ~ detect ~ ~2 ~ barrier 0 setblock ~ ~2 ~ structure_void"}},{id:commandblock_minecart,Command:setblock ~3 ~-1 ~1 chain_command_block 2 replace {auto:1b,Command:"/execute @a[score_psnp_min=0,score_psnp=0] ~ ~ ~ execute @e[type=armor_stand,name=psns] ~ ~ ~ detect ~ ~2 ~ barrier 0 setblock ~ ~2 ~ structure_void"}},{id:commandblock_minecart,Command:setblock ~3 ~-1 ~ chain_command_block 5 replace {auto:1b,Command:"/execute @e[type=armor_stand,name=psno] ~ ~ ~ detect ~ ~2 ~ air 0 kill @e[type=armor_stand,name=psno,r=0]"}},{id:commandblock_minecart,Command:setblock ~4 ~-1 ~ chain_command_block 5 replace {auto:1b,Command:"/execute @a[score_psnp_min=1,score_psnp=1] ~ ~ ~ execute @e[type=armor_stand,name=psno] ~ ~ ~ detect ~ ~2 ~ structure_void 0 setblock ~ ~2 ~ barrier"}},{id:commandblock_minecart,Command:setblock ~5 ~-1 ~ chain_command_block 5 replace {auto:1b,Command:"/execute @e[type=armor_stand,name=psns] ~ ~ ~ detect ~ ~2 ~ air 0 kill @e[type=armor_stand,name=psns,r=0]"}},{id:commandblock_minecart,Command:setblock ~6 ~-1 ~ chain_command_block 5 replace {auto:1b,Command:"/execute @a[score_psnp_min=1,score_psnp=1] ~ ~ ~ execute @e[type=armor_stand,name=psns] ~ ~ ~ detect ~ ~2 ~ structure_void 0 setblock ~ ~2 ~ barrier"}},{id:commandblock_minecart,Command:setblock ~7 ~-1 ~ chain_command_block 5 replace {auto:1b,Command:"/execute @e[type=endermite,name=psng] ~ ~ ~ scoreboard players set @e[type=armor_stand,name=psnm] psnc 50"}},{id:commandblock_minecart,Command:setblock ~8 ~-1 ~ chain_command_block 5 replace {auto:1b,Command:"/execute @e[type=endermite,name=psng] ~ ~ ~ scoreboard players set @a psng 1"}},{id:commandblock_minecart,Command:setblock ~9 ~-1 ~ chain_command_block 2 replace {auto:1b,Command:"/kill @e[type=endermite,name=psng]"}},{id:commandblock_minecart,Command:setblock ~9 ~-1 ~-1 chain_command_block 4 replace {auto:1b,Command:"/execute @e[type=armor_stand,name=psnm,score_psnc_min=50] ~ ~ ~ entitydata @e[type=armor_stand,name=psnm,score_psnc_min=50,r=0] {CustomName:\\\"psnr\\\"}
"}},{id:commandblock_minecart,Command:setblock ~8 ~-1 ~-1 chain_command_block 4 replace {auto:1b,Command:"/execute @e[type=armor_stand,name=psnr] ~ ~ ~ detect ~ ~1 ~ bedrock 0 setblock ~ ~1 ~ structure_void 2"}},{id:commandblock_minecart,Command:setblock ~7 ~-1 ~-1 chain_command_block 4 replace {auto:1b,Command:"/kill @e[type=armor_stand,name=psnr]"}},{id:commandblock_minecart,Command:setblock ~6 ~-1 ~-1 chain_command_block 4 replace {auto:1b,Command:"/title @a[score_psns_min=1,score_psns=1,score_psnp_min=1,score_psnp=1] actionbar [\\\"\\\",{\\\"text\\\":\\\"Edit Phase\\\",\\\"color\\\":\\\"dark_gray\\\",\\\"bold\\\":true}]"}},{id:commandblock_minecart,Command:setblock ~4 ~ ~-1 command_block 5 replace {auto:0b,Command:"/scoreboard objectives remove psng"}},{id:commandblock_minecart,Command:setblock ~5 ~ ~-1 chain_command_block 5 replace {auto:1b,Command:"/scoreboard objectives remove psnc"}},{id:commandblock_minecart,Command:setblock ~6 ~ ~-1 chain_command_block 5 replace {auto:1b,Command:"/scoreboard objectives remove psnp"}},{id:commandblock_minecart,Command:setblock ~7 ~ ~-1 chain_command_block 5 replace {auto:1b,Command:"/scoreboard objectives remove psns"}},{id:commandblock_minecart,Command:setblock ~8 ~ ~-1 chain_command_block 5 replace {auto:1b,Command:"/fill ~-7 ~-3 ~-1 ~2 ~1 ~3 air 0"}},{id:commandblock_minecart,Command:setblock ~ ~ ~1 command_block 0 replace {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]}]}]}]}