Knuckleheads

 is a platform game released in 2008. The player controls a pair of knuckleheads with the aim of making it to the bell at the end of each level.

Controls
left right Left and right - Move

D - move

up down Up and down - Adjust the length of the chain

Hazards

 * Spikes - Spikes can appear on any block and will hurt both heads.
 * Fireballs - Fireballs can either jump up from the lava or travel in a circular pattern. They will hurt both heads.
 * Lava - Any head that touches the lava results in game over. Some levels the lava is stationary, some levels the lava tide goes up and down, and some levels they continuously rise and force the player to be very quick.
 * Gates - Some later levels have gates which go up and down and will hurt any head. The player has to be very careful to pass through them while they're up, and not make contact with any metal part of the gate.
 * Coloured Pegs - The player must use the correct colour head to connect with the peg, the wrong colour results in losing one health and unable to connect with it.
 * Coloured Blocks - The player can step on the blocks but if they use the wrong coloured head they will lose one health.
 * Coloured Fireballs - They travel from one tube to another and can hurt the player if they touch the opposite coloured head.

Pickups
Star Capsules - They are the points you consume during gameplay. You get the points when either of the heads make contact

Trivia

 * Nitrome's first game blog post about was about the release of Knuckleheads.
 * The game's colours (pink and green) are the same colours seen in the game Ribbit, they both a have pink and green character, the enemies are pink and green and some hazards are also pink and green.
 * The name of the game is based in on the insult knuckle head.
 * This game's main characters also appear in Nitrome Must Die, but as floor 50's boss. They're much bigger than they are in Knuckleheads, so the player must watch where they come from when the chain breaks.