Reset too easy to do accidentally

[alexer]

Spacebar isn't mentioned in the how-to-play, but it resets the game without any confirmation.

Accidentally resetting a game that is going well sucks. I should know, since I found this feature by accidentally hitting spacebar while playing this with >370k points and close to getting a 32768 tile.

I propose mentioning the spacebar-reset-functionality in the how-to-play section and adding a confirmation dialog. (Or just removing the feature, reloading the page isn't that hard)

I reported this upstream too (gabrielecirulli#83), but this affects this version much more since:

• Your left thumb is sitting right on top of the spacebar due to the Q and E keys
• The games are much longer

[michalopler]

You are probably right. This spacebar reset came from the original 2048, and I didn't realized that you are more likely to press it in the 3D. So I removed the feature.