Detecting exploiters in my roblox game

Biggest rule: don't try to catch them on the client. The client belongs to the exploiter, they can delete any LocalScript you put there. Do the checks on the server instead. Never trust what a RemoteEvent hands you - check the player can actually do the thing (are they close enough to the item, is it off cooldown, do they own it) before you do it. Rate limit your remotes too, a lot of exploits are just spam-firing them. For movement, a simple server check comparing a character's position between heartbeats catches most speed and teleport hacks. Give it some slack though, or you'll kick people on bad wifi.