Blocks appear as a square.
Three sticky blocks
|Ability||Can be used as platforms|
The first block variation in Knuckleheads.
Sticky blocks appear to be normal blocks covered in a sticky dark purple goo substance. As shown by the title, they are square. When the player's head retracts from the block, a loud squish sound is heard.
Sticky blocks' surfaces are covered in a purple sticky substance. While some blocks are completely covered with the sticky substance, others are only half-covered. Sticky blocks allow the angry heads to traverse across walls and ceilings since the characters can stick to the blocks. Frequently, they appear throughout the game.
The coloured blocks sleeping
|Attack||Dangerous to touch|
|Damage||Loss of one heart|
The second block variation in Knuckleheads.
These blocks are either pink or green with a face printed on them.
Like the other enemies in Knuckleheads, coloured blocks can only be touched with the head the same colour as the block. A coloured block will smile when the right Knucklehead is placed on the right block.
When contact is made with the opposite head, however, the block will become angry and emit a wall of coloured electricity around itself, causing the player to lose one heart of their health. The frequency of these blocks' appearance is not as often as sticky blocks' are.
- Falling from a high height and landing on the wrong coloured head will not affect the player. This is a glitch, however.