Knuckleheads is a game on nitrome. It has the usual 20 levels and arcade theme. You play as the chain with two balls on it. And you have to get to the bell. Theres a picture of it in the botom corner.
You use the left and right arrow keys to turn. Use up and down keys to extend and contract the chain. To kill the bad guys you hit them with the same colored head. There’s a picture if it on the left. You also get stars by hitting them with a head. there’s a picture in the middle right. there also sticky pads witch allow you to go on walls and the ceiling. There’s a picture in the upper left corner. There also lava on the bottom of the level. Like the lava in the main picture. But you don’t see that till the last levels.
That’s what knuckle head is.