Yes, get the latest snapshot. If it is a previously made world you want to change, a mod is required. However, if you are wanting a new world, install the snapshot, then enable cheats. Typing /gamemode into the chat bar with either a 1 or 0 at the end will change the game mode to either creative or survival. I forget which is which. I know nothing about mods, but installing the new snapshot will not change a previous world. Best of luck.
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