"Freestyle mode" refers to a state or activity where someone is able to express themselves or perform without following strict rules or guidelines. They have the freedom to be creative and innovative in their actions or thoughts. Full definition
Being increasingly old and boring, we played around in Freestyle mode for just a few minutes before retreating to the familiar territory of our grid of icons. (androidcentral.com)
The all new Freestyle mode allows you to win with style and crazy stunts! (uk.gamesplanet.com)
Activision has announced a special Mii Freestyle mode for the Wii version of Guitar Hero World Tour and unveiled a number of exclusive tracks for inclusion in the European versions of the upcoming Legends of Rock sequel. (eurogamer.net)