How to create a lava survival pvp map in minecraft?

Question

I'm trying to create funny pvp maps for my friends and I. I would like to go deeper and try a lava survival map. The goal is basically to make the lava go x block up every x time/tick (or replace any air block at a given height + 1 every x time/tick)

How can I achieve this using in-game mechanics?

Answer 1

You can use /fill command.

I imagine you will have something like square map , for example 50 * 50. You need to know coordinates of corners and it would be good to have it surrounded by some solid blocks (glass, stone, etc), so lava won't flow everywhere...

Then inside a map you will have some islands etc.

All you need is some control room, for example I would make it above the gameplay area, so you can have access for it and there is no problem with loading the chunks... In this area you will need some redstone.

I already mentioned /fill command, this will be useful.

/fill <x1> <y1> <z1> <x2> <y2> <z2> <TileName> <dataValue> replace [replaceTileName] [replaceDataValue]

For our use it will shrink into :

/fill <x1> Y <z1> <x2> Y <z2> minecraft:lava 0 replace minecraft:air 

Now how to setup it:

• You need to be sure that all blocks you want to flood with lava are air ones. And be sure that flammable materials can be destroyed if you have such a settings enabled (gamerule). If careful enough, you can make even renewable arena.
• You will need one commandblock PER each Y value (I expect you want to raise the lava by one block at time).
• You will need to have "slowing" redstone or some timers.

Resumé:

Check the coordinates of opposite corners of arena, one will be x1,z1, second will be x2,z2. Y coordinate will be same in both parts of command, meaning the layer you want to flood.

Now the timers. You can make kinda extended redstone setup (repeaters slowing signal down, or droppers, hoppers, etc), or you can use /scoreboard.

If using redstone, all you need is to start the game by pressing some button and let redstone flow (best would be with hoppers which can slow down the current for long time, but are compact) run through the commands. Then it depends on how fast you will make the redstone.

So your commandblocks will be something like:

/fill 0 1 0 50 1 50 minecraft:lava 0 replace minecraft:air
/fill 0 2 0 50 2 50 minecraft:lava 0 replace minecraft:air 
/fill 0 3 0 50 3 50 minecraft:lava 0 replace minecraft:air 

For resetting arena, you can then use something like reverse command:

/fill 0 1 0 50 YMAX 50 minecraft:air 0 replace minecraft:lava

Answer 2

Yes, you can. Suppose you have a map/map part going up vertically, you first need to fill all the unused air blocks around the map structure, so they don't get filled by lava. Then, for each lava rise, use a separate Command block:

/fill X1 Y1 Z1 X2 Y1 Z2 minecraft:lava 0 replace minecraft:air

The command will fill a flat square of air with lava on your map - then, add a Coparator and a few Repeaters leading from the 1st (n-th) Command block (for delay), leading into the 2nd (n+1-th) Command block.

So, using n as the nujmber of repeats (depth of the lava), and X1, X2, Z1, Z2, Y as the lava fill square, you use theese Commands:

/fill X1 Yn Z1 X2 Yn Z2 minecraft:lava 0 replace minecraft:air

/fill X1 Yn+1 Z1 X2 Yn+1 Z2 minecraft:lava 0 replace minecraft:air

/fill X1 Yn+2 Z1 X2 Yn+2 Z2 minecraft:lava 0 replace minecraft:air
...
(until you reach the top)

To undo this, use:

/fill X1 Y Z1 X2 Ymax Z2 minecraft:air 0 replace minecraft:lava

Notes:

• You use 1 Command block, 1 Comparator and as many Repeaters as youy want per lava fill step.

EDIT!:

use these command block system NEXT to the structure:

/fill ~X1 Y ~Zn ~X2 Ymax ~Z2 minecraft:air 0 replace minecraft:lava

next to it (to positive X) this:

/clone ~+1 ~ ~+3 ~+1 ~ ~+3 ~ ~+3 ~

towards positive Z place Repeaters facing towards the CMD blocks. Next to the System there should be a wall of RS blocks to power the repeaters when cloned!

Answer 3

Pros of this answer: Infinite height

• Place Armorstand at same level at all blocks where the lava should be

• Give yourself a cmd block

  /give @p minecraft:command_block
  

• Tag the armorstand so we can select them later

  /scoreboard players tag @e[type=ArmorStand,r=10] add lavaMarker
  

r : Radius to the command_blocks so you only tag the nearby ones and not all you've ever made Note: You have to rerun this command when ever you playe new ArmorStand

• Create a new scoreboard

  /scoreboard objectives add liveTime dummy
  

• Create a repeating cmd block redstone needed

  /scoreboard players add @e[tag=lavaMarker] liveTime 1
  

• Make your ArmorStands invisible and invincible

  /entitydata @e[tag=lavaMarker] {Invisible:1,Invulnerable:1}
  

• Make them teleport up every x ticks with a chain command bloock after the repeating command block up there

  /execute @e[tag=lavaMarker,score_liveTime_min=40] ~ ~ ~ tp @e[tag=lavaMarker,c=1] ~ ~1 ~
  
  /scoreboard players reset @e[tag=LavaMarker,score_liveTime_min=40] liveTime
  

• set lava at ArmorStands

  /execute @e[tag=lavaMarker] ~ ~ ~ detect ~ ~ ~ minecraft:air 0 setblock ~ ~ ~ minecraft:lava
  

To pause remove the redstone block.

To reset replace lava with air /fill and tp the armorstands down.

/execute @e[tag=lavaMarker] ~ ~ ~ tp @e[tag=lavaMarker,c=1] ~ ~-XXX ~