3. Defying gravity. Do I need to explain this, you can make a tree float by cutting the trunk, there are floating islands, yet mobs, items, anvils, sand, red sand and gravel still use normal physics. Minecraft gravity also would be weird since the minecraft world is flat. In real life, the further you got from the center of the map, the more it would feel more and more steeper. Also, if the map is infinite, how does the sun set.