Minecraft wiki entry for Beating_a_challenge_map, associated text: Map creators will often create something in a map that looks like a reward, but in reality is a deadly trap. Always be on the lookout for something suspicious, as this could very well be TNT. Also, some maps take advantage of external tools or data values in commands, and make it so that TNT will detonate when hit like it did in earlier Minecraft versions. This makes it impossible to destroy without detonating. In that case, you can pour water on it