Always test with (use “Test” → “Client” and “Server” in Studio).
-- (Optional) Fire a remote to show an effect on client remote:FireClient(player) end fe script roblox
| Mistake | Why It Fails | |---------|---------------| | Changing a part’s color from a LocalScript | Other players won’t see the change (server needs to do it) | | Moving a HumanoidRootPart from a LocalScript | Server will snap it back – exploiters can’t fly | | Updating leaderstats from a LocalScript | Server never validates → exploiters can fake numbers | Always test with (use “Test” → “Client” and