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Why can't I destroy or break blocks?

I was playing Minecraft in single-player mode today when I turned on the "Open to LAN" option. I then changed my game mode to "creative" to fly back to my house, but when I turned my game mode back to "survival", I couldn't place anything down or break any blocks!

I've tried re-downloading Minecraft but that didn't help at all. It's just me in this world, so another user couldn't have changed any settings.

Why is this happening and how can I fix it?

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marked as duplicate by Ender, Kevin Yap, Frank, kotekzot, Alok Aug 15 '12 at 17:22

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Are you sure you set it back to survival and not adventure? Survival mode is 0, creative is 1 and adventure is 2 IIRC. – fredley Aug 7 '12 at 16:29
Sounds like your house is at the origin area and you are not marked as an admin. You are unable to alter blocks within the spawn area in this case. – James Aug 7 '12 at 16:55
Sounds like adventure mode. – waifu Aug 8 '12 at 1:05

Sounds like you put it on to Adventure Mode. Try closing it down and try it again.

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Either you are in adventure mode, or you are building/destroying in the spawn, which the game does not like.

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You just need to be an op to build in the spawn. – Guvante Aug 10 '12 at 19:02
This is only true if you are in an actual server. Otherwise spawns are not protected in Single-player. LAN is just opening a single-player world. – jacen.garriss Apr 25 '13 at 16:01

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