Madness Accelerant is an online game at 43g.Com. You can play Madness Accelerant in your browser for free.Your task in this intense fighting game is to fight through hoards of enemies and at the same time you have to kill the clown. Keyboard Control: Left / Right Arrow Keys - Move. Up / Down Arrow Keys - Aim. A - ATtack. S - Jump. D - Swap Weapon. Mouse Control: A, D - Move. Mouse - Aim / Shoot. W - Jump. S - Swap Weapon.