AUMSS/Runtime/Checkpoint.cs

using UdonSharp;
using UnityEngine;
using VRC.SDKBase;

[UdonBehaviourSyncMode(BehaviourSyncMode.NoVariableSync)]
[DisallowMultipleComponent]
[AddComponentMenu("Artyom Scripting System/Checkpoint")]
public class Checkpoint : UdonSharpBehaviour
{
    public GameObject targetObject; // The game object to move

    // Each player has their own progress, so this stays local: syncing it let one player's checkpoint block everyone's
    private bool hasBeenUsed = false;

    public override void OnPlayerTriggerEnter(VRCPlayerApi player)
    {
        if (hasBeenUsed || !player.isLocal) return;
        if (targetObject == null)
        {
            Debug.LogError("[AUMSS] Checkpoint: Target Object isn't assigned.");
            return;
        }

        targetObject.transform.SetPositionAndRotation(transform.position, transform.rotation);
        hasBeenUsed = true;
        gameObject.SetActive(false); // Hides the checkpoint for this player once used
    }
}