Free Hero Mesh

  Check if the top value matches any others in the list above the mark. If
  it doesn't match any, then the value remains and it pushes true; if it
  does match, then the top value is removed and it pushes false instead.

VolumeAt  ( x y -- volume )
  Finds the greatest volume among objects at the specified location.

Walkable  ( x y -- bool )
  Tells if the current object could walk on the specified coordinates,
  according to Height, Climb, and CollisionLayers. This object is not
  counted, even if it is at the specified coordinates. Shoving, hit bits,
  Volume, etc are not checked.

,Walkable  ( obj x y -- bool )
  Similar to Walkable but for a specified object instead of this one. You
  may also specify a class, in which case it uses the default values of
  that class instead of the current values of an object.

WinLevel  ( -- )
  Ends all execution and accepts the input sequence that resulted in the
  current game state as a valid solution. (In other words, the goal of the
  game is to find a sequence of inputs that result in the execution of a
  WinLevel instruction, without causing any errors or executing LoseLevel.)

,WinLevel  ( score -- )