Slippery

Slippery is a TrackMania Nations Forever game mode featuring slightly altered time attack maps, where the player has little to no control of their operated vehicle. 
The slippery game mode was first unveiled with the update 4 of the game. The very same update included a 30 map campaign, on which Nadeo organised a tournament called "The Grand Slip Cup" to promote the newly introduced game mode.
Despite the initial interest of the players, the game mode soon fell into discord due to Nadeo primarily focusing on more competitive game modes, such as time attack, stunt or backwards. As of today, there is only 1 server running this game mode, as opposed to nearly 200 after its addition.