10 Levels! Exploding Creepers with blast radii are the secret with this command. This also works in 1.12 (Not 1.13+ though, or 1.10-). A big shout out to user pixel0727 who made the original, Mr. Garretto's Command Combiner, and ME! The image is a thumbnail of TNT: A Minecraft Parody.
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
/scoreboard players tag @e[type=item] add tnt1 {Item:{id:"minecraft:tnt",Count:1b},OnGround:1b}
/scoreboard players tag @e[type=item] add tnt2 {Item:{id:"minecraft:tnt",Count:2b},OnGround:1b}
/scoreboard players tag @e[type=item] add tnt3 {Item:{id:"minecraft:tnt",Count:3b},OnGround:1b}
/scoreboard players tag @e[type=item] add tnt4 {Item:{id:"minecraft:tnt",Count:4b},OnGround:1b}
/scoreboard players tag @e[type=item] add tnt5 {Item:{id:"minecraft:tnt",Count:5b},OnGround:1b}
/scoreboard players tag @e[type=item] add tnt6 {Item:{id:"minecraft:tnt",Count:6b},OnGround:1b}
/scoreboard players tag @e[type=item] add tnt7 {Item:{id:"minecraft:tnt",Count:7b},OnGround:1b}
/scoreboard players tag @e[type=item] add tnt8 {Item:{id:"minecraft:tnt",Count:8b},OnGround:1b}
/scoreboard players tag @e[type=item] add tnt9 {Item:{id:"minecraft:tnt",Count:9b},OnGround:1b}
/scoreboard players tag @e[type=item] add tnt10 {Item:{id:"minecraft:tnt",Count:10b},OnGround:1b}
/execute @e[tag=tnt1] ~ ~ ~ /summon Creeper ~ ~ ~ {Fuse:0,ExplosionRadius:1,ActiveEffects:[{Id:14,Amplifier:0,Duration:199980,ShowParticles:0b}]}
/execute @e[tag=tnt2] ~ ~ ~ /summon Creeper ~ ~ ~ {Fuse:0,ExplosionRadius:2,ActiveEffects:[{Id:14,Amplifier:0,Duration:199980,ShowParticles:0b}]}
/execute @e[tag=tnt3] ~ ~ ~ /summon Creeper ~ ~ ~ {Fuse:0,ExplosionRadius:3,ActiveEffects:[{Id:14,Amplifier:0,Duration:199980,ShowParticles:0b}]}
/execute @e[tag=tnt4] ~ ~ ~ /summon Creeper ~ ~ ~ {Fuse:0,ExplosionRadius:4,ActiveEffects:[{Id:14,Amplifier:0,Duration:199980,ShowParticles:0b}]}
/execute @e[tag=tnt5] ~ ~ ~ /summon Creeper ~ ~ ~ {Fuse:0,ExplosionRadius:5,ActiveEffects:[{Id:14,Amplifier:0,Duration:199980,ShowParticles:0b}]}
/execute @e[tag=tnt6] ~ ~ ~ /summon Creeper ~ ~ ~ {Fuse:0,ExplosionRadius:6,ActiveEffects:[{Id:14,Amplifier:0,Duration:199980,ShowParticles:0b}]}
/execute @e[tag=tnt7] ~ ~ ~ /summon Creeper ~ ~ ~ {Fuse:0,ExplosionRadius:7,ActiveEffects:[{Id:14,Amplifier:0,Duration:199980,ShowParticles:0b}]}
/execute @e[tag=tnt8] ~ ~ ~ /summon Creeper ~ ~ ~ {Fuse:0,ExplosionRadius:8,ActiveEffects:[{Id:14,Amplifier:0,Duration:199980,ShowParticles:0b}]}
/execute @e[tag=tnt9] ~ ~ ~ /summon Creeper ~ ~ ~ {Fuse:0,ExplosionRadius:9,ActiveEffects:[{Id:14,Amplifier:0,Duration:199980,ShowParticles:0b}]}
/execute @e[tag=tnt10] ~ ~ ~ /summon Creeper ~ ~ ~ {Fuse:0,ExplosionRadius:10,ActiveEffects:[{Id:14,Amplifier:0,Duration:199980,ShowParticles:0b}]}
/kill @e[tag=!,type=Item]
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 ~8 ~ ~2 stained_hardened_clay 0 hollow"},{id:commandblock_minecart,Command:"fill ~2 ~-2 ~-2 ~8 ~-1 ~2 stained_glass 3 0 stained_hardened_clay"},{id:commandblock_minecart,Command:"fill ~3 ~-2 ~-1 ~7 ~-1 ~1 chain_command_block 5"},{id:commandblock_minecart,Command:"setblock ~3 ~-1 ~1 chain_command_block 2"},{id:commandblock_minecart,Command:"fill ~7 ~-1 ~1 ~4 ~-1 ~1 chain_command_block 4"},{id:commandblock_minecart,Command:"setblock ~7 ~-2 ~1 chain_command_block 1"},{id:commandblock_minecart,Command:"setblock ~3 ~-2 ~ chain_command_block 3"},{id:commandblock_minecart,Command:"fill ~7 ~-2 ~ ~4 ~-2 ~ chain_command_block 4"},{id:commandblock_minecart,Command:"setblock ~7 ~-2 ~-1 chain_command_block 3"},{id:commandblock_minecart,Command:"setblock ~3 ~-2 ~-1 repeating_command_block 5"},{id:commandblock_minecart,Command:"blockdata ~3 ~-1 ~ {auto:1,Command:\"/kill @e[tag=!,type=Item]\"}"},{id:commandblock_minecart,Command:"blockdata ~3 ~-1 ~1 {auto:1,Command:\"/execute @e[tag=tnt10] ~ ~ ~ /summon Creeper ~ ~ ~ {Fuse:0,ExplosionRadius:10,ActiveEffects:[{Id:14,Amplifier:0,Duration:199980,ShowParticles:0b}]}\"}"},{id:commandblock_minecart,Command:"blockdata ~4 ~-1 ~1 {auto:1,Command:\"/execute @e[tag=tnt9] ~ ~ ~ /summon Creeper ~ ~ ~ {Fuse:0,ExplosionRadius:9,ActiveEffects:[{Id:14,Amplifier:0,Duration:199980,ShowParticles:0b}]} \"}"},{id:commandblock_minecart,Command:"blockdata ~5 ~-1 ~1 {auto:1,Command:\"/execute @e[tag=tnt8] ~ ~ ~ /summon Creeper ~ ~ ~ {Fuse:0,ExplosionRadius:8,ActiveEffects:[{Id:14,Amplifier:0,Duration:199980,ShowParticles:0b}]} \"}"},{id:commandblock_minecart,Command:"blockdata ~6 ~-1 ~1 {auto:1,Command:\"/execute @e[tag=tnt7] ~ ~ ~ /summon Creeper ~ ~ ~ {Fuse:0,ExplosionRadius:7,ActiveEffects:[{Id:14,Amplifier:0,Duration:199980,ShowParticles:0b}]} \"}"},{id:commandblock_minecart,Command:"blockdata ~7 ~-1 ~1 {auto:1,Command:\"/execute @e[tag=tnt6] ~ ~ ~ /summon Creeper ~ ~ ~ {Fuse:0,ExplosionRadius:6,ActiveEffects:[{Id:14,Amplifier:0,Duration:199980,ShowParticles:0b}]} \"}"},{id:commandblock_minecart,Command:"blockdata ~7 ~-2 ~1 {auto:1,Command:\"/execute @e[tag=tnt5] ~ ~ ~ /summon Creeper ~ ~ ~ {Fuse:0,ExplosionRadius:5,ActiveEffects:[{Id:14,Amplifier:0,Duration:199980,ShowParticles:0b}]} \"}"},{id:commandblock_minecart,Command:"blockdata ~6 ~-2 ~1 {auto:1,Command:\"/execute @e[tag=tnt4] ~ ~ ~ /summon Creeper ~ ~ ~ {Fuse:0,ExplosionRadius:4,ActiveEffects:[{Id:14,Amplifier:0,Duration:199980,ShowParticles:0b}]} \"}"},{id:commandblock_minecart,Command:"blockdata ~5 ~-2 ~1 {auto:1,Command:\"/execute @e[tag=tnt3] ~ ~ ~ /summon Creeper ~ ~ ~ {Fuse:0,ExplosionRadius:3,ActiveEffects:[{Id:14,Amplifier:0,Duration:199980,ShowParticles:0b}]} \"}"},{id:commandblock_minecart,Command:"blockdata ~4 ~-2 ~1 {auto:1,Command:\"/execute @e[tag=tnt2] ~ ~ ~ /summon Creeper ~ ~ ~ {Fuse:0,ExplosionRadius:2,ActiveEffects:[{Id:14,Amplifier:0,Duration:199980,ShowParticles:0b}]} \"}"},{id:commandblock_minecart,Command:"blockdata ~3 ~-2 ~1 {auto:1,Command:\"/execute @e[tag=tnt1] ~ ~ ~ /summon Creeper ~ ~ ~ {Fuse:0,ExplosionRadius:1,ActiveEffects:[{Id:14,Amplifier:0,Duration:199980,ShowParticles:0b}]}\"}"},{id:commandblock_minecart,Command:"blockdata ~3 ~-2 ~ {auto:1,Command:\"/scoreboard players tag @e[type=item] add tnt10 {Item:{id:\\\"minecraft:tnt\\\",Count:10b},OnGround:1b}\"}"},{id:commandblock_minecart,Command:"blockdata ~4 ~-2 ~ {auto:1,Command:\"/scoreboard players tag @e[type=item] add tnt9 {Item:{id:\\\"minecraft:tnt\\\",Count:9b},OnGround:1b}\"}"},{id:commandblock_minecart,Command:"blockdata ~5 ~-2 ~ {auto:1,Command:\"/scoreboard players tag @e[type=item] add tnt8 {Item:{id:\\\"minecraft:tnt\\\",Count:8b},OnGround:1b}\"}"},{id:commandblock_minecart,Command:"blockdata ~6 ~-2 ~ {auto:1,Command:\"/scoreboard players tag @e[type=item] add tnt7 {Item:{id:\\\"minecraft:tnt\\\",Count:7b},OnGround:1b}\"}"},{id:commandblock_minecart,Command:"blockdata ~7 ~-2 ~ {auto:1,Command:\"/scoreboard players tag @e[type=item] add tnt6 {Item:{id:\\\"minecraft:tnt\\\",Count:6b},OnGround:1b}\"}"},{id:commandblock_minecart,Command:"blockdata ~7 ~-2 ~-1 {auto:1,Command:\"/scoreboard players tag @e[type=item] add tnt5 {Item:{id:\\\"minecraft:tnt\\\",Count:5b},OnGround:1b}\"}"},{id:commandblock_minecart,Command:"blockdata ~6 ~-2 ~-1 {auto:1,Command:\"/scoreboard players tag @e[type=item] add tnt4 {Item:{id:\\\"minecraft:tnt\\\",Count:4b},OnGround:1b}\"}"},{id:commandblock_minecart,Command:"blockdata ~5 ~-2 ~-1 {auto:1,Command:\"/scoreboard players tag @e[type=item] add tnt3 {Item:{id:\\\"minecraft:tnt\\\",Count:3b},OnGround:1b}\"}"},{id:commandblock_minecart,Command:"blockdata ~4 ~-2 ~-1 {auto:1,Command:\"/scoreboard players tag @e[type=item] add tnt2 {Item:{id:\\\"minecraft:tnt\\\",Count:2b},OnGround:1b}\"}"},{id:commandblock_minecart,Command:"blockdata ~3 ~-2 ~-1 {auto:1,Command:\"/scoreboard players tag @e[type=item] add tnt1 {Item:{id:\\\"minecraft:tnt\\\",Count:1b},OnGround:1b}\"}"},{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]"}]}]}]}
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