Game modes

In Minecraft there are game modes that you can change to.

Primary Gamemodes
The three primary Gamemodes are Hardcore, creative, and survival. Hardcore cannot be accessed by anything after making a creative or survival mode game, including commands. Creative and survival can be accessed by commands.

Secondary Gamemodes
The two secondary Gamemodes are peaceful and adventure. Adventure can only be accessed by commands. Peaceful can be accessed in options.

Extra Gamemodes
The extra Gamemodes are accessed the same way as peaceful mode. They are easy, normal, and hard.