Google Snake Game Wiki

The icon for fast mode

Fast Mode is a mode on Google Snake Game in which the game moves 1.33 times faster than Classic.

Yarmi's Guide

To keep things short, the optimal strategy is the shortest path to any apple. If you have fast enough reaction you can turn in time, but if you don't, just go for the middle of the board and turn to the apple as soon you are able to react. In fast mode reacting in time is even harder, so you should practice and keep trying.