Groups comparison

Directional Force - 1981 to 2016
Conveyor belts, wind, magnets, slippery slopes or similar, cause movement in a way that the player may resist, utilize, or must avoid.

Directional Force from a Moving Surface (Conveyor Belts)[conveyer belts] - 1983 to 2016
A moving surface (floor or conveyor belts for example) causes movement in a way that the player may resist, utilize, or must avoid.

Directional Force from Wind - 1983 to 2017
Natural or artificial wind cause movement in a way that the player may resist, utilize, or must avoid.

Directional Force caused by a slippery, tilting or slanting surface (Slides) - 1984 to 2019
A slippery tilting surface causes movement in a way that the player may resist, utilize, or must avoid.

Directional force from liquid current - 1997 to 2015
Currents cause movement in a way that the player may resist, utilize, or must avoid.