So, those two yellow cubes are controllers, you can operate the cannon using them. But don`t forget to click one of your thumbsticks first to enable cannon aiming mode and freeze yourself in place for a more persice shot. Click one of them again to enable movement and leave cannon aiming mode.
The green one is an indicator, not a gem socket. So you were already able to operate the cannon, try it again if you interested, and thanks for playing, man.
