Main Article: Barrel
Main Article: Boulder
Main Article: Clouds
The Clouds are found in the Shield levels, and can strike you with Lightning, but are also used to gain the Shield. As long as you are not struck by lighting, you will be fine.
Main Article: Gears
The Gears are located in the Clock Tower, and will kill you if you touch them. As long as you are quick, you have nothing to worry about.
Main Article: Laser
The Laser is a more common obstacle. It shoots in a straight line from one end to another, and as long as you duck under it, or use the Shield, you can survive.
Main Article: Mug
The Mugs are thrown by the Black Knight, and likewise only show up in the levels that he does. In Dark Castle they kill you with one hit, and in Beyond Dark Castle and Return To Dark Castle, they take down a chunk of your health.
Main Article: Spike Trap
The Spike Traps are found through the castle, and are only dangerous if you stand on them. The spikes come up in intervals and stab you.
Main Article: Stalactite
The Stalactites are on the ceiling, and randomly fall. If they land on you, you get killed. The Shield or the Helmet can defend you from them, but be careful, for on the harder Difficulties, the floating platforms will be destroyed.
Main Article: Swinging Scythe
The Swinging Scythe just swings back and forth, blocking your path. If you touch it, you are killed. To get past if, find a switch to turn it off.
In Return to Dark Castle, the Swinging Scythe only appears in one of the Dungeons.
Main Article: Trees
The Trees are found in the Helicopter Pack levels, and are harmless as long as you do not run the Helicopter Pack into them. Sometimes fuel or rocks will be on a tree branch.