engine

• atmospheric/environmental effects
  • water: bubbles, ripples, splashes, underwater fog
  • weather: clouds (moving), fog, rain
• physics: floating logs
• other: tires kick up dirt, dust, rocks, water; leave skid/tread marks; sunrays; flying airplanes, birds (+ land), helicopters (+ land), hot air balloons; train, battleship, sailboat, submarine

level design

• environmental interaction
  • pushable objects: canoe, cars (some), construction cones, pylons, sawhorses; hay bales, logs, metal gates, oil drums, porto-potties, road signs, telephone poles, tires, trash bags, wood fences
  • other: knockover construction cones, pylons, sawhorses; metal gates oil drums, porto-potties, road signs, telephone poles, wood fences