Like all dangerous munitions, the Maru Cannon must be loaded with extreme care. Do not attempt to place Maru in the cannon yourself — simply leave the cannon unattended and Maru will be drawn inexplicably into it.
Next, make sure that Maru is coiled tightly at the bottom of the cannon, to attain the necessary “spring-loaded” effect.
When firing, be aware that Maru may not always follow the desired trajectory.
Spotted on Maru’s blog by Marianne H.