How do I teleport someone who enters a specific tunnel on Minecraft 1.17.1?

Question

I am making a map on Minecraft 1.17.1 and I'm tying to make a challenge where you need to go through the correct tunnel, if you go through the wrong one you'll get teleported to the start.

I don't know how to do it, so I "tried" using the execute command but I don't know how to really use it.

Answer 1

This can be easily achieved with a command block and the tp command:

tp @p[distance=..4] x y z

Where x, y, and z are the respective coordinates of your starting position.

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Give yourself a command block with:

give @s command_block

Place it where it can be concealed (e.g. under a block in the tunnel) and set it's configuration to:

• Block Type: Repeat
• Condition: Unconditional
• Redstone: Always Active
• Command Input: tp @p[distance=..4] x y z
  • Where x, y, and z are the respective coordinates of your starting position.