How do you be able to use letter keys in Happy Wheels?

In Happy Wheels, you can use letter keys by customizing your controls in the game's options menu. Typically, the default controls involve the arrow keys for movement and spacebar for actions, but you can remap these to letter keys if you prefer. Simply go to the settings, look for the controls section, and assign the desired letter keys to the actions you want. After saving your settings, you’ll be able to use those keys during gameplay.