Blocks won't break unless with right tools? [duplicate]

Question

Recently I've been playing Minecraft with my brother on LAN. This morning I found that I couldn't destroy any blocks except with the right tool type, eg: shovels for sand/dirt and pickaxes for rock, etc. The main problem is that I got stuck down a tunnel with no pickaxes or shovels, and I couldn't leave until my brother came with supplies. I'm playing survival and using the survival island seed which is amazing. Any help will be appreciated and just to be sure, I'm not on adventure, and I can't dig anything bare hand, or shovels dig stone, or pickaxe dig dirt.

Answer 1

You are most likely playing in Adventure mode, which may have been a result of accidentally clicking one of the option when setting up LAN. To solve this, type /gamemode s or /gamemode "username" 0 If you find that you are unable to do this, do the following:

• Close the LAN Server
• Open the world you play on and then click open to LAN
• Enable cheats (for future use) and then set the gamemode to survival
• Let the games begin!

Without the correct tools anyway, it would have been hard to escape from the cave.

Answer 2

Despite what you say, the only explanation is that you are in fact in adventure mode, not survival. Issue the following command to change the server back to survival: /gamemode s. If you are not an operator, this will have to be done in the settings (which means restarting the server), or in the server console (omit the /).