The hole itself is a polygon cylinder with an area of ground all around it, so when the object switches, you won’t notice anything. When an object gets within range of the hole, it stops respecting the normal ground and starts respecting the hole’s physics. The secret of the hole is that Donut County runs two physics universes at once, the hole’s world and the real one. (“It’s the last thing you should do if you’re a physics game,” Esposito says.) That would all come later, but the jam game set the fundamentals for the trick the game pulls to deal with the fact that physics engines are fundamentally not really supposed to make holes in the ground. To start with, Donut County was his entry to the Peter Molydeux game jam, What Would Molydeux? Made in a hurry, it was rough enough that Esposito didn’t really worry too much about little things like the way objects interacted with the edge of the hole and collided with each other as they fell in.
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