After finding some evidence that someone knew exactly where to dig a vertical shaft down to diamond, I am wondering if it would be possible to shield ores from sight until the player has a line-of-sight. Since X-ray and similar tools are client-side mods, we can't, as admins, stop their use, as it merely changes the graphics they see, not how they move. Can a lead shield be made to block the x-rays? Possible options, as I see them: 1. Make a general anti-cheat system based on a checksum or validation hook that might exist in MC 2. Somehow disguise blocks that can't be seen (EG, no/insufficient light directly on them) as raw stone. This wouldn't work for diamonds adjacent to lava, but it would cover a lot of ores. (Actually, that sounds rather awesome. Until you light up an area, you can't tell what you're digging through, ore-wise. Dirt and gravel are unaffected.) 3. Jamming: Make raw stone look like diamond ore (somehow)? 4. Line-of-sight requirement. Would this be computationally intensive? Is any of this possible? #2 seems promising, but it really depends on how the x-ray works. Can blocks be edited to misidentify if there's not enough light?