In head-to-head atari adventure, each player has a different shape.
Each player gets their own home castle.
Player 1 gets the original gold castle off the main thoroughfare.
Player 2 gets the copper castle, which, in game 1, is also off the main thoroughfare, but, in other games, is beyond the catacombs, opposite where the white castle is.
Player 3 gets the jade castle, which is in the blue maze. If there is no third player, there will be no jade castle.
Your home castle is displayed on the left side bar of the game so you don't forget which castle is yours.
Each player gets their own key matching the color of their castle. Each dragon is afraid of a different color key.
Yorgle, the yellow dragon, is afraid of the gold key.
Grindle, the green dragon, is afraid of the jade key.
Rhindle, the red dragon, is afraid of the copper key.
You can hear sounds such as a player picking up an object or a dragon roaring when they occur one or two rooms away from yours. More distant sounds will be fainter.
Dragons come alive whenever anyone respawns.
You can get locked inside a castle. In the white and black castles, this creates a very strange Hotel California effect when trying to leave, as you appear to leave out the bottom exit but immediately appear through the top entrance. This is how the original code worked if you were ever able to get inside a locked castle.
You can request guides through the mazes, with black lines showing how to get between castles and brown lines showing how to get to places where objects often are.