I love making YouTube videos and I love making tutorials so I tossed this together: A Minecraft Redstone tutorial (That I made up) on a 6+ Combo Lock, and when the incorrect combination is placed and the activation key is hit, a TNT explosion goes off which kills the player, but does no damage to any blocks! Sorry that it's so long, I have other shorter videos as well if you want to check those out! Thanks a lot!
Awesome Minecraft Redstone Tutorial: A 6 (Or more) Lever Combination Lock w/ Backup TNT Explosion!