"Slippery surfaces" refers to areas or objects that are smooth, wet, or greasy, making them difficult to walk on or causing things to slide easily. Full definition
ABS keeps the vehicle straight while retaining steering capability when braking on slippery surfaces by preventing wheel lock - up. (topspeed.com)
One group has a theme of grass and hills, another is fire themed with lava while a third (and most difficult) group is ice themed with slippery surfaces. (gimmegimmegames.com)
On slippery surfaces such as grass and snow, torque can be balanced between the front and rear wheels to enhance traction. (landroverusa.com)