I recreated the datapack from the "Third Life" series
With this datapack you spawn in a 500 by 500 world. You only have three lives.
On your first two lives, you team up with your friends, but on your last life your only goal is to kill the other players.

If the datapack doesn't work, try using the command below.

/reload


Updates:
v1. Fixed the world border being the wrong size.
v2. Fixed some minor problems. Fixed the tutorial message.

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Idea not created by me.

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